Weisen Zhang

University of Birmingham, Birmingham, England, United Kingdom

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Publications (20)74.49 Total impact

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    ABSTRACT: Purpose In Asia moderate alcohol users have better lung function. Never users have more inactive aldehyde dehydrogenase 2 (ALDH2) alleles (A) potentially generating confounding, because inactive alleles may increase acetaldehyde exposure and reduce lung function. Methods We examined the association of ALDH2 genotypes with percentage predicted lung function (forced expiratory volume in 1 second (FEV1); forced vital capacity (FVC)) for age, sex and height among 5,641 older Chinese using multivariable linear regression. Results ALDH2 genotypes were associated with alcohol use and height but not other attributes. Inactive alleles were inversely associated with lung function (% predicted FEV1 -1.52%, 95% confidence interval (CI) -2.52% to -0.51% for one inactive allele and -2.05%, 95% CI -3.85% to -0.26% for two inactive alleles compared to two active alleles; and for % predicted FVC -1.25%, 95% CI -2.15% to -0.35% and -1.65%, 95% CI -3.25% to -0.04%). The association of moderate use with lung function was attenuated after adjusting for ALDH2, in addition to other potential confounders. Conclusions Previous findings in Chinese may be confounded by ALDH2. High frequency of inactive ALDH2 alleles in East Asia may exacerbate the effect of environmental acetaldehyde exposure on lung function, and potentially on chronic obstructive pulmonary disease.
    Annals of Epidemiology. 01/2014;
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    ABSTRACT: Dairy products consumption is increasingly common globally. Most of the evidence concerning dairy products comes from observational studies in western populations which are inevitably open to confounding. To triangulate the evidence concerning dairy products, we examined the associations of whole cow's milk consumption with cardiovascular risk factors in a non-Western setting with a different pattern of milk consumption and cardiovascular diseases from Western populations. We used multivariable censored linear or logistic regression to examine cross-sectionally the adjusted associations of whole cow's milk consumption (none (n = 14892), 1-3/week (n = 2689) and 3+/week (n = 2754)) with cardiovascular risk factors in Chinese (≥50 years) in the Guangzhou Biobank Cohort Study. Whole cow's milk consumption was negatively associated with systolic blood pressure (3+/week compared to none -2.56 mmHg, 95% confidence interval (CI) -3.63 to -1.49), diastolic blood pressure (-1.32 mmHg, 95% CI -1.87 to -0.77) and triglycerides (-0.06 mmol/L, 95% CI -0.11 to -0.002), but was positively associated with HDL-cholesterol (0.02 mmol/L,95% CI 0.01 to 0.04) and fasting glucose (0.08 mmol/L, 95% CI 0.01 to 0.16) adjusted for age, sex, phase of study, socio-economic position, lifestyle (smoking, alcohol use and physical activity) and adiposity, but had no obvious association with LDL-cholesterol or the presence of diabetes. Whole cow's milk consumption had heterogeneous associations with cardiovascular risk factors. Higher whole cow's milk consumption was associated with lower levels of specific cardiovascular risk factors which might suggest risk factor specific biological pathways with different relations to blood pressure and lipids than glucose.
    PLoS ONE 01/2014; 9(1):e84813. · 3.53 Impact Factor
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    ABSTRACT: Observationally lower testosterone is associated with an unhealthier cardiovascular (CVD) risk profile, but this association is open to confounding and reverse causality. The authors examined the association of testosterone with well-established cardiovascular disease (CVD) risk factors (blood pressure, low-density lipoprotein (LDL) cholesterol, high-density lipoprotein (HDL)cholesterol and fasting glucose) and the Framingham score using a Mendelian randomization analysis with a separate-sample instrumental variable estimator. To minimize reverse causality, a genetic score predicting testosterone was developed in 289 young Chinese men from Hong Kong, based on three selected testosterone-related single nucleotide polymorphisms (rs10046, rs1008805 and rs1256031). Multivariable censored and linear regressions were used to examine the association of genetically predicted testosterone levels with CVD risk factors and Framingham score among 4212 older Chinese men from the Guangzhou Biobank Cohort Study. Predicted testosterone was unrelated to systolic blood pressure [-0.11 mmHg, 95% confidence interval (CI) -0.70 to 0.48], diastolic blood pressure (0.04 mmHg, 95% CI -0.27 to 0.36), fasting glucose (0.02 mmol/l, 95% CI -0.02 to 0.06) or Framingham score (0.02, 95% CI -0.0001 to 0.03) but associated with higher LDL-cholesterol (0.02 mmol/l, 95% CI 0.01 to 0.04) and lower HDL-cholesterol (-0.01 mmol/l, 95% CI -0.02 to -0.001), after adjustment for potential confounders (age, education, smoking status, use of alcohol and body mass index). Our findings did not corroborate observed protective effects of testosterone on cardiovascular risk factors or risk of ischaemic heart disease among men, but raises the possibility that higher testosterone may be associated with an unhealthier lipid profile.
    International Journal of Epidemiology 12/2013; · 6.98 Impact Factor
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    ABSTRACT: Observational studies show moderate alcohol use negatively associated with ischemic heart disease (IHD) and cardiovascular disease (CVD). However, healthier attributes among moderate users compared to never users may confound the apparent association. A potentially less biased way to examine the association is Mendelian randomization, using alcohol metabolizing genes which influence alcohol use. We used instrumental variable analysis with aldehyde dehydrogenase 2 (ALDH2) genotypes (AA/GA/GG) as instrumental variables for alcohol use to examine the association of alcohol use (10 g ethanol/day) with CVD risk factors (blood pressure, lipids and glucose) and morbidity (self-reported IHD and CVD) among men in the Guangzhou Biobank Cohort Study. ALDH2 genotypes were a credible instrument for alcohol use (F-statistic 74.6). Alcohol was positively associated with HDL-cholesterol (0.05 mmol/L per alcohol unit, 95% confidence interval (CI) 0.02 to 0.08) and diastolic blood pressure (1.15 mmHg, 95% CI 0.23 to 2.07) but not with systolic blood pressure (1.00 mmHg, 95% CI -0.74 to 2.74), LDL-cholesterol (0.03 mmol/L, 95% CI -0.03 to 0.08), log transformed triglycerides (0.03 mmol/L, 95% CI -0.01 to 0.08) or log transformed fasting glucose (0.01 mmol/L, 95% CI -0.006 to 0.03), self-reported CVD (odds ratio (OR) 0.98, 95% CI 0.76 to 1.27) or self-reported IHD (OR 1.10, 95% CI 0.83 to 1.45). Low to moderate alcohol use among men had the expected effects on most CVD risk factors but not fasting glucose. Larger studies are needed to confirm the null associations with IHD, CVD and fasting glucose.
    PLoS ONE 01/2013; 8(7):e68054. · 3.53 Impact Factor
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    ABSTRACT: BACKGROUND: Mendelian randomization studies provide a means of assessing causal relations without interventions, but require valid genetic instruments. We assessed the credibility of aldehyde dehydrogenase 2 (ALDH2) as a genetic instrument for alcohol use in Southern Chinese men. METHODS: We genotyped the single nucleotide polymorphism rs671 of ALDH2 in 4867 men from the Guangzhou Biobank Cohort Study. We used linear regression to assess the strength of the association of ALDH2 variants with alcohol use, whether ALDH2 variants were independently associated with socio-economic position or other potential confounders and whether associations of ALDH2 variants with cardiovascular risk factors (systolic and diastolic blood pressure, HDL- and LDL-cholesterol, fasting glucose), triglycerides, body mass index, self reported cardiovascular disease, self-reported ischaemic heart disease, cognitive function (delayed 10-word recall and Mini Mental State Examination score) and liver function (alanine transaminase and aspartate transaminase) were fully mediated by alcohol use. RESULTS: The minor allele frequency (A) of ALDH2 was 0.29. The F statistic for ALDH2 variants was 75.0, suggesting that substantial weak instrument bias is unlikely. ALDH2 variants were not associated with socio-economic position, smoking or physical activity. ALDH2 variants were only associated with diastolic blood pressure and HDL-cholesterol, but these genetic associations with blood pressure and HDL-cholesterol were attenuated after adjusting for alcohol use, suggesting the apparent genetic associations were possibly mediated by alcohol use. CONCLUSIONS: ALDH2 variants are a credible genetic instrument for Mendelian randomization studies of alcohol use and many attributes of health in Southern Chinese men.
    International Journal of Epidemiology 12/2012; · 6.98 Impact Factor
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    ABSTRACT: A male epidemic of ischaemic heart disease (IHD) emerges with economic development. It has previously been hypothesised that this epidemic is due to nutritionally driven levels of pubertal sex steroids, which lead to a more atherogenic body shape and lipid profile in boys but not girls, without any sex-specific effects on glucose metabolism. This study tests this hypothesis by examining the association of childhood meat eating with IHD risk in a developing Chinese population. Multivariable linear and censored regression was used in a cross-sectional study of 19,418 Chinese older (≥ 50 years) men and women from the Guangzhou Biobank Cohort Study (phases 2 and 3) to assess the adjusted associations of childhood meat eating with waist to hip ratio (WHR), high-density lipoprotein cholesterol and fasting plasma glucose. Adjusted for age, childhood hunger, life-course socioeconomic position and current lifestyle childhood almost daily meat eating compared with less than weekly meat eating was associated with higher WHR (0.007, 95% CI 0.0003 to 0.01) in men but not women. No association with fasting glucose was observed. Given the potential limitations of this study, especially the crude nature of the exposure and modest findings, the results should be considered as preliminary. However, they do lend support to the hypothesis that the male epidemic of premature IHD and sexual divergence in IHD rates that occur with economic development may be nutritionally driven in childhood. In elucidating the developmental origins of non-communicable chronic diseases, more attention should be focused on the sociohistorical context and the role of puberty.
    Journal of epidemiology and community health 06/2011; 65(6):522-8. · 3.04 Impact Factor
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    ABSTRACT: Women usually report attributes of masculinity as attractive. These are attributes are metabolically expensive. We examined the trade off of a key attribute of masculinity, muscularity, proxied by recalled adolescence build, with lifetime reproductive success in the developing country setting of Southern China. We used poisson multivariable regression in 19,168 older (≥ 50 years) Chinese from the Guangzhou Biobank Cohort Study (phases 2 and 3) to examine the sex-stratified, adjusted associations of recalled adolescent relative weight (light (n = 6730), average (n = 9344), and heavy (n = 3094)) with number of offspring. Among men, recalled heavy adolescent weight compared with light was associated with an incident rate ratio for offspring of 1.08 (95% confidence interval [CI] 1.04-1.13) adjusted for age. This estimate was unchanged by adjustment for life course socio-economic position. There was no such association in women. Male physical attractiveness, possibly representing levels of testosterone, was rewarded by lifetime reproductive success, despite potential costs. Socio-economic development may facilitate an inevitable move toward environmentally driven higher levels of testosterone with corresponding public health implications for any conditions or societal attributes driven by testosterone. Further investigation is warranted.
    Annals of epidemiology 01/2011; 21(1):56-60. · 2.95 Impact Factor
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    ABSTRACT: In observational studies from western countries childhood emotional adversity is usually associated with adult cardiovascular disease. These findings are open to contextual biases making evidence from other settings valuable. We examined the association of a potential marker of childhood emotional adversity with cardiovascular disease risk factors in a developing country. We used multivariable regression in cross-sectional analysis of older (≥50 years) men (n = 7,885) and women (n = 20,886) from the Guangzhou Biobank Cohort Study (2003-8) to examine the adjusted association of early life (<18 years) parental death (none, one or two deaths) with blood pressure, fasting glucose, LDL-cholesterol, HDL-cholesterol, triglycerides, body mass index (BMI), waist-hip ratio (WHR) and white blood cell count (WBC). We used seated height and delayed 10-word recall to assess content validity of parental death as a measure of childhood emotional adversity. We also examined whether associations varied by sex. Early life parental death was associated with shorter age- and sex-adjusted seated height. It was also associated with lower 10-word recall score adjusted for age, sex, socio-economic position, leg length and lifestyle. Similarly, adjusted early life parental death was not associated with blood pressure, fasting glucose, LDL-cholesterol or HDL-cholesterol but was associated with lower BMI (-0.40, 95% confidence interval (CI) -0.62 to -0.19 for 2 compared with no early life parental deaths) and triglycerides. Associations varied by sex for WHR and WBC. Among men only, early life parental death was associated with lower WHR (-0.008, 95% CI -0.015 to -0.001) and WBC (-0.35 10(9)/L, 95% CI -0.56 to -0.13). In a non-western population from a developing country, childhood emotional adversity was negatively associated with some cardiovascular risk factors, particularly among men. Our study suggests that some of the observed associations in western populations may be socially rather than biologically based or may be population specific.
    PLoS ONE 01/2011; 6(5):e19675. · 3.53 Impact Factor
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    ABSTRACT: With economic development, there is an emerging epidemic of diabetes in China despite relatively low levels of obesity. Muscle mass, for which adolescence is a key developmental window, may reduce vulnerability to diabetes. We examined the association of recalled adolescent build with diabetes in a large sample from the developing country setting of southern China. We used multivariable regression in cross-sectional data (2005-2008), from the Guangzhou Biobank Cohort Study (phases 2 and 3) for 19,524 older (≥ 50 years) Chinese to examine the adjusted associations of recalled adolescent relative weight (light [n = 6843], average [n = 9529], and heavy [n = 3152]) with clinically measured diabetes. As older adults, heavy adolescents had a lower risk of diabetes (odds ratio = 0.86, 95% confidence interval: 0.75-0.99) than light adolescents adjusted for age, sex, education, smoking, leg length, and seated height. This association was stronger after additional adjustment for waist/hip ratio and body mass index. Poor living conditions during adolescence, resulting in low muscle mass, could contribute to vulnerability to diabetes, which, if confirmed, could be relevant to the emerging epidemic of diabetes in the developing world, as well as to minorities and migrants elsewhere.
    Annals of epidemiology 01/2011; 21(1):61-6. · 2.95 Impact Factor
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    ABSTRACT: Observational studies in Western settings show moderate alcohol use associated with better cognitive function, but they are vulnerable to contextual bias. Evidence from non-Western settings may be useful to verify causality. We examined such association in southern China where alcohol use is low. We used multivariable linear regression in cross-sectional data from the Guangzhou Biobank Cohort Study to assess sex-stratified associations of alcohol use (never, occasional, moderate, heavy and former drinker) with delayed 10-word recall score for all 3 phases (N = 28,537) and Mini-Mental State Examination (MMSE) score in phase 3 (N = 9,571). Delayed 10-word recall scores were higher in moderate drinkers compared with never drinkers among men (0.30 words, 95% confidence interval [CI]: 0.18 to 0.42) but not women (0.02; 95% CI: -0.12 to 0.17), adjusted for sociodemographic factors. Occasional alcohol users also had higher 10-word recall scores among men (0.27; 95% CI: 0.18 to 0.37) and women (0.30; 95% CI: 0.23 to 0.37). These estimates were little altered by further adjustment for cardiovascular risk factors. Results for MMSE scores were similar. Alcohol may not drive the association between moderate use and better cognitive function, which instead may be due to confounding by general moderation in lifestyle.
    Annals of epidemiology 12/2010; 20(12):873-82. · 2.95 Impact Factor
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    ABSTRACT: Estrogen has neurotrophic and neuroprotective properties in animal and in vitro studies. Epidemiological studies are inconclusive, but suggest a positive association between endogenous estrogen exposure (measured by reproductive period, the number of years between menarche and menopause) and later life cognitive function. Structural equation modeling was used in a cross-sectional study of 11,094 naturally postmenopausal multiparous Chinese older (≥50 years) women from the Guangzhou Biobank Cohort Study (phases 2 and 3) to assess the interrelationship of four proxies of higher endogenous estrogen exposure (longer reproductive period, older age of first pregnancy, lower parity and shorter average duration of breast feeding per child) with immediate and the delayed 10-word recall score in phases 2 and 3, and with the mini-mental state examination (MMSE) score in phase 3 (5641 women). Adjusted for age, education, childhood and adulthood socio-economic position and physical activity, longer reproductive period was associated with higher scores (0.02 words per year, 95% confidence interval (CI) 0.008-0.02 for delayed recall and 0.05 MMSE score, 95%CI 0.04-0.07, respectively). Lower parity and shorter average duration of breast-feeding per child were also associated with better cognitive function. In a large cohort of naturally postmenopausal Chinese women proxies of greater endogenous estrogen exposure were associated with better cognitive function. These findings support biological evidence for a cognitively protective role of endogenous estrogen.
    Psychoneuroendocrinology 12/2010; 36(6):864-73. · 5.59 Impact Factor
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    ABSTRACT: Earlier pubertal maturation in women may be associated with better cognition. It is unclear whether or not this also occurs in men. We tested the hypothesis that earlier pubertal development in men was associated with better cognition in later adulthood in a developing Chinese population. Multivariable linear regression was used in cross-sectional study of 2463 older, Chinese men from the Guangzhou Biobank Cohort Study. Mean pubertal age was calculated as the mean of recalled ages of first nocturnal emission, voice breaking and pubarche. We assessed the association of mean pubertal age with delayed 10-word recall and mini-mental state examination (MMSE) scores. Adjusted for age and education, 1 year earlier mean pubertal age was associated with higher delayed 10-word recall (0.06 [95% confidence interval = 0.02-0.10]) and higher MMSE (0.08 [0.03-0.13]) scores. Additional adjustment for childhood and adulthood socio-economic position, sitting height, and leg length did not change the results. These preliminary findings suggest earlier maturation in men is associated with better cognitive function in later adulthood. Whether pubertal timing is a marker of earlier life exposures or reflects a biological relation between somatrophic and/or gonadotrophic hormones and cognitive development is unclear.
    Annals of epidemiology 12/2010; 20(12):948-54. · 2.95 Impact Factor
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    ABSTRACT: Physical activity may modify the association of adiposity with type 2 diabetes. We investigated the independent and joint association of adiposity and physical activity with fasting plasma glucose, impaired fasting glucose, and type 2 diabetes in a Chinese population. Middle-aged and older Chinese (n=28,946, ≥50 years, 72.4%women) from the Guangzhou Biobank Cohort Study were examined in 2003-2008. Multivariable regression was used in a cross-sectional analysis. BMI, waist circumference, and waist-to-hip ratio (WHR) were positively associated with type 2 diabetes after multiple adjustment, most strongly for WHR with odds ratio (OR) of 3.99 (95% CI 3.60-4.42) for highest compared with lowest tertile. Lack of moderate-to-vigorous physical activity, but not walking, was associated with diabetes with an OR of 1.29 (1.17-1.41). The association of moderate-to-vigorous activity with fasting glucose varied with WHR tertiles (P=0.01 for interaction). Within the high WHR tertile, participants who had a lack of moderate-to-vigorous activity had an OR of 3.87 (3.22-4.65) for diabetes, whereas those who were active had an OR of 2.94 (2.41-3.59). In this population, WHR was a better measure of adiposity-related diabetes risk than BMI or waist circumference. Higher moderate-to-vigorous activity was associated with lower diabetes risk, especially in abdominally obese individuals.
    Diabetes care 11/2010; 33(11):2342-8. · 7.74 Impact Factor
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    ABSTRACT: Inadequate childhood nutrition is associated with poor short-term academic and cognitive outcomes. Dietary supplementation with meat is associated with better cognitive outcome in children. Whether childhood nutrition has life long effects on cognitive function is unclear. We examined the association of childhood meat eating with adulthood cognitive function in southern China where the older population lived through significant hardship during their early years. Multivariable linear regression was used in a cross-sectional study of 20,086 Chinese men and women aged > or = 50 years from the Guangzhou Biobank Cohort Study (phases 2 and 3) 2005-8. We assessed the association of childhood meat eating with delayed 10-word and immediate recall score. Adjusted for age, sex, education, childhood and adulthood socio-economic position and current physical activity, childhood meat eating almost daily, when compared to yearly or never childhood meat eating, was positively associated with delayed recall score (additional number of words recalled out of 10 = 0.22 [95% confidence interval = 0.11-0.31]). Similarly adjusted, childhood meat eating about once a month, about once a week and almost daily were positively associated with immediate recall score (additional number of words recalled out of 30 = 0.38 [0.23-0.54], 0.73 [0.56-0.89] and 0.76 [0.55-0.98] respectively). More frequent childhood meat eating was associated with better cognition through to old age. If confirmed, these results highlight the importance of adequate childhood nutrition and they also emphasise the childhood and adolescent antecedents of adult disease, with corresponding public health implications for healthy aging.
    European Journal of Epidemiology 07/2010; 25(7):507-16. · 5.12 Impact Factor
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    ABSTRACT: In western populations, young age of menarche is associated with increased cardiovascular risk. Little is known about the potential impact of menarche on the metabolic syndrome (as a proxy for cardiovascular risk) in rapidly economically developing populations where age of menarche is falling. We sought to determine the relation between age of menarche and the metabolic syndrome in a rapidly developing Chinese population. We carried out a retrospective historical cohort study of 7349 women from the Guangzhou Biobank Cohort Study, China, enrolled in 2003-2004. Cardiovascular risk factors were obtained from physical examination; age of menarche was obtained from self-report. The main outcome measure was the metabolic syndrome and its components. Adjusted for age, education, and number of pregnancies, young age of menarche (<12.5 years) compared with age of menarche > or =14.5 years was associated with a higher risk of the metabolic syndrome (odds ratio = 1.49; 95% confidence interval = 1.22-1.82), central obesity (1.35; 1.10-1.65), raised blood pressure (1.34; 1.09-1.65), raised fasting glucose (1.40; 1.15-1.71), and higher triglyceride levels (1.36; 1.12-1.67). Further adjustment by waist circumference attenuated these effects, but the odds ratios remained elevated. Earlier age of menarche experienced by younger women in China today, now 12.5 years on average in urban populations, may contribute to an increase in the metabolic syndrome and thereby an increase in cardiovascular disease as these women age. These results further highlight the importance of childhood antecedents of adulthood disease.
    Epidemiology 11/2007; 18(6):740-6. · 5.74 Impact Factor
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    ABSTRACT: Better childhood conditions, inferred from height and specifically leg length, are usually protective against ischemic heart disease and its risk factors in Western countries. In other geoethnic populations, height is less clearly protective, casting doubt on there being a biological etiology. To clarify the role of childhood conditions, we examined the associations of height and its components with cardiovascular risk among older Chinese people. We used multivariable regression to examine the associations of height and its components with blood pressure, lipid profile, and diabetes in 10413 older Chinese adults (mean age=64.6 years). After we adjusted for age, gender, socioeconomic status, and lifestyle habits, greater sitting height was associated with diabetes and dyslipidemia. Longer legs were associated with lower pulse pressure and lower low-density lipoprotein cholesterol. We provide indirect anthropometric evidence for the role of pre-pubertal and pubertal exposures on cardiovascular risk. Pubertal exposures are stronger than are prepubertal exposures but may be influenced by osteoporotic decline in old age. Further research should establish whether the observed relations are ethnically specific or relate to the stage or trajectory of socioeconomic development.
    American Journal of Public Health 11/2007; 97(10):1834-41. · 3.93 Impact Factor
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    ABSTRACT: To study the prevalence of goiter associated with some factors in Guangzhou after the implementation of universal salt iodization. With cross-sectional study, the electronic questionnaire was used to investigate basic demographic indexes, socioeconomic indexes and the history of thyroid diseases in 10305 Guangzhou elderly people who aged 50 and more by face to face interview. The prevalence of goiter was got by thyroid palpation, and the relationship between the prevalence and factors mentioned above was analyzed. Chi-square test was used to test the difference of the rates, and Logistic regression model was used to do multi-factors analysis. (1) Overall, 442 cases of thyroid large were found, including I grade 330, formed 74.7%, and II grade 112, formed 25.3%. The prevalences in total, female and male were 4.3%, 5.1% (369 cases) and 2.4% (73 cases) respectively. The prevalence was significantly higher in the female than that in the male. (2) The results of multi-Logistic regression showed that gender, history of thyroid diseases and education were the main impact factors. The risks suffered from goiter in the female, in those who had ever suffered from thyroid diseases and in those who were middle school education and higher were more 1.81 times, 5.43 times and 1.25 times than those in the male in those who had never suffered from thyroid diseases and in those who were primary school education and lower respectively. The iodine nutrition of Guangzhou elderly population was fairly moderate. Female and those who had ever suffered from thyroid diseases got a higher risk suffering from goiter.
    Wei sheng yan jiu = Journal of hygiene research 04/2007; 36(2):194-6.
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    ABSTRACT: The Guangzhou Biobank Cohort Study (GBCS), initiated by TH Lam (Hong Kong), CQ Jiang (Guangzhou), and KK Cheng (Birmingham), has been in part modelled on the Kadoorie Study of Chronic Disease in China (KSCDC), and the UK Biobank., Initial seed funding came from the Universities of Hong Kong and Birmingham, the Guangzhou No. 12 Hospital (Guangzhou Occupational Disease Prevention & Treatment Centre), the Guangzhou Public Health Bureau, and the Guangzhou Science and Technology Bureau. The Clinical Trials Service Unit at Oxford University has provided technical advice, especially in the planning and setting up of the project. Whereas the KSCDC recruits adults aged 35-74 years nationwide from five rural counties and five urban districts, the GBCS focuses on older people aged at least 50 years in a mega-city of ~10 million. Of these, 6.4 million are permanent residents with locally registered households and the remainder are mostly migrants from other parts of the country. Guangzhou, the provincial capital of Guangdong province in southern China, is one of the most economically developed regions of China (Figure 1). Uniquely, the lifetime experience of older urban residents in Guangzhou has straddled two macro-environments. Their parents were born into a pre-industrial environment, where living standards had been essentially unchanged for millennia, and where male heights (an anthropometric marker of living standards) were similar to those in France at their pre-industrial nadir.,-,These circumstances largely continued until after the establishment of the People's Republic of China (PRC) in 1949, although there were some isolated pockets of transient, haphazard economic growth along the eastern seaboard and around the treaty ports of Shanghai and to a lesser extent Guangzhou during the first half of the 20th century., However, with the more
    International Journal of Epidemiology 09/2006; 35(4):844-52. · 6.98 Impact Factor
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    ABSTRACT: To study the effect of dust exposure and smoking on mortality. Based on the Guangzhou Occupational Health Surveillance Record System established in 1989-1992, 61,648 factory workers, aged > or = 30, occupationally exposed to dust and non-exposure to dust or any other hazardous substances(controls), were included in a prospective cohort study. (1) 28 were lost to follow-up. Malignant neoplasm was most common among 1,186 deaths. (2) Most subjects were male workers, aged 35 to 44, with secondary education, and married. 42.2% had ever smoked and 32.8% were ever-drinkers. (3) To compare with non-exposure, non-smoking + non-smoking and non-exposure respectively, the adjusted RR of death from all causes, malignant neoplasm and respiratory diseases were 1.24, 1.34 and 1.96 respectively for dust exposed workers(compared to control, P < 0.01), 1.16, 1.37 and 1.63 respectively for those smoking(compared to non-smoker except RR of death from respiratory diseases, P < 0.01), and 1.48, 1.85 and 3.12 respectively for those smoking and dust exposure, which were far greater than those either smoked or exposed to dust alone(P < 0.01). (4) The influence of dust exposure on death was mainly showed in occupational exposure to silica dust and wood dust. Both dust exposure and smoking may increase the mortality, and they had synergistic effect.
    Zhonghua lao dong wei sheng zhi ye bing za zhi = Zhonghua laodong weisheng zhiyebing zazhi = Chinese journal of industrial hygiene and occupational diseases 10/2002; 20(5):365-8.
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    ABSTRACT: To study the main causes of death in workers from different industries in Guangzhou. The industrial systems in Guangzhou were classified into six categories according to the Chinese Public Health Inspection Statistical Report. Baseline data on 79,547 workers, age > or = 35, were retrieved from individual health records under the Guangzhou Occupational Health Surveillance Record System established in 1989-1992. In this prospective cohort study, the workers' vital status and causes of death were followed up until 31 December 1998. Using SPSS 10.0, crude death rates were calculated and relative risks(RR) (95% CI) were estimated using Cox proportional-hazard models. (1) Among 79,547 workers were 49,355 men and 30,192 women, with mean age of (43.8 +/- 6.5) years, and 64% were aged 35-44. The mean age difference of workers in different industries was +/- 1 year. At baseline, 41% had been exposed to occupational hazards. Exposure was most prevalent in petroleum chemical industry(53.9%), followed by metallurgical industry, and the lowest exposure was in mechanical industry (30.2%). (2) The mean follow-up period was (8.0 +/- 1.3) years with 633,510 person-years. 1,577 workers had died with a total death rate of 248.9 per 100,000 person-years. The death rate in rubber industry was the highest, followed by metallurgical and petroleum chemical industries. Malignant neoplasms, vascular and respiratory diseases were most common, constituting 80.3% of all causes of death. (3) For all causes of death and the three main categories, the top three crude death rates were observed in rubber and petroleum chemical industries, and in the metallurgical industry except for vascular causes. The rubber industry had the highest crude death rate for all and vascular causes, and the metallurgical industry for malignant neoplasms and respiratory causes. (4) With the light industry as a reference (RR = 1.0), the metallurgical industry had the highest adjusted relative risks (RR) (95% CI) of 1.62(1.20-2.18) and 7.42(3.38-16.31) for malignant neoplasms and respiratory causes, respectively. The rubber industry had the highest RR of 1.69(1.40-2.04) for all causes. A significant RR of 2.03(1.43-2.88) for vascular causes was observed only in the rubber industry. The main causes of death varied from industry. Malignant neoplasms and respiratory diseases were the leading causes in metallurgical and petroleum chemical industries. In rubber industry, vascular and respiratory causes were most common. Preventive measures for disease control should be tailor-made for each industry.
    Zhonghua lao dong wei sheng zhi ye bing za zhi = Zhonghua laodong weisheng zhiyebing zazhi = Chinese journal of industrial hygiene and occupational diseases 08/2002; 20(4):289-92.

Publication Stats

197 Citations
74.49 Total Impact Points

Institutions

  • 2013
    • University of Birmingham
      • Department of Public Health, Epidemiology and Biostatistics
      Birmingham, England, United Kingdom
  • 2007–2013
    • The University of Hong Kong
      • Department of Community Medicine
      Hong Kong, Hong Kong
    • Southern Medical University
      • School of Public Health and Tropical Medicine
      Guangzhou, Guangdong Sheng, China