Naoyoshi Takatsuka

University Hospital Medical Information Network, Tokyo, Tokyo-to, Japan

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Publications (23)73.98 Total impact

  • Article: Randomized crossover study of latanoprost and travoprost in eyes with open-angle glaucoma.
    Akira Sawada, Tetsuya Yamamoto, Naoyoshi Takatsuka
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    ABSTRACT: To compare the intraocular pressure (IOP)-lowering effects of 0.005% latanoprost to that of 0.004% travoprost in eyes with open-angle glaucoma (OAG). Forty-two patients with OAG who received either latanoprost or travoprost every evening for 12 weeks, and then switched to the other medication for another 12 weeks. The IOP measurements were made with a Goldmann applanation tonometer (GAT) at the baseline, and at 1, 3, 4, and 6 months after the treatment. The IOP at the untreated baseline and at the end of each treatment period was measured at 10:00, 12:00, and 16:00 hours. The central corneal thickness (CCT) was measured at each visit using an ultrasonic pachymeter. The mean baseline IOP was 13.9 ± 2.5 mmHg, and the CCT was 536.7 ± 30.5 μm. Latanoprost reduced the IOP by 2.5 ± 1.7 mmHg and travoprost by 2.6 ± 1.5 mmHg from the baseline (p = 0.6807). The CCT decreased significantly to 531.9 ± 30.3 at 3 months (p = 0.0160) and to 529.4 ± 30.5 μm at 6 months (p = 0.0002) after the therapy. The decrease was significantly greater in eyes after travoprost (p = 0.0049). Travoprost has similar effect as latanoprost in reducing the IOP in glaucoma patients with relatively low IOPs. The use of prostaglandin analogs can decrease the CCT, and this change should be considered when the IOPs obtained by GAT are analyzed.
    Albrecht von Graæes Archiv für Ophthalmologie 08/2011; 250(1):123-9. · 2.17 Impact Factor
  • Article: Prevalence of tinnitus in community-dwelling Japanese adults.
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    ABSTRACT: Several studies have reported the prevalence of tinnitus among general populations; however, most of these studies were conducted in Europe or the United States. We estimated the prevalence of tinnitus among the general adult population in Japan. The subjects were participants in the Takayama Study, a population-based cohort study. In 2002, a total of 14 423 adults (6450 men and 7973 women) aged 45 to 79 years responded to a self-administered questionnaire that inquired about history of tinnitus, which was defined as episodes lasting longer than 5 minutes, excluding those occurring immediately after noise exposure. Respondents were also asked about the loudness and severity of tinnitus. Overall, 11.9% of the subjects reported having tinnitus; the percentage was somewhat higher among men (13.2%) than women (10.8%). The prevalence of tinnitus increased with age in both sexes. Approximately 0.4% of the overall population reported that tinnitus had a severe effect on their ability to lead a normal life. Medical history of hypertension or ischemic heart diseases, use of steroid or antihypertensive medication, and employment as a factory worker or machine operator were associated with tinnitus status in both men and women. Tinnitus is relatively common in Japan. Although the use of various definitions of tinnitus in different studies makes it difficult to compare prevalence among populations, the present prevalence estimate was similar to those in studies in Europe and the United States.
    Journal of Epidemiology 06/2011; 21(4):299-304. · 1.86 Impact Factor
  • Article: Cigarette smoking and other lifestyle factors in relation to the risk of pancreatic cancer death: a prospective cohort study in Japan.
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    ABSTRACT: To examine the association of smoking and lifestyle factors with pancreatic cancer death in the prospective design. Mortality from pancreatic cancer in regard to smoking, body mass index, physical activity, and alcohol, coffee and green tea intake, was studied in a prospective cohort of 30,826 inhabitants in Takayama, Japan. In 1992, each subject completed a self-administered questionnaire on demographic information, smoking, drinking habits, diet, exercise and medical histories. The response rate was 85.3%. From 1992 to 1999, 33 men and 19 women died due to pancreatic cancer. Hazard ratios and 95% confidence intervals were determined using Cox proportional hazards models. Women who were defined as current smokers at baseline had significant and increased risk of pancreatic cancer death after adjustment for age, body mass index and history of diabetes mellitus (Hazard ratio: 4.77, 95% confidence intervals: 1.58-14.4). There were significant positive associations of pancreatic cancer death with the years of smoking and the number of cigarettes consumed daily in women in a dose-dependent manner. Current smokers indicated a non-significant risk increase in men (Hazard ratio: 3.81, 95% confidence intervals: 0.88-16.6). Body mass index, physical activity, and alcohol, coffee and green tea intake were not significantly associated with pancreatic cancer death. These data suggested that smoking increases the risk of death from pancreatic cancer in Japanese women.
    Japanese Journal of Clinical Oncology 11/2010; 41(2):225-31. · 1.78 Impact Factor
  • Article: Association of farming with the development of cedar pollinosis in Japanese adults.
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    ABSTRACT: Although cross-sectional studies have reported that the prevalence of allergy is reduced on a farm, few prospective studies were carried out on adults. We examined the association of experience of farming with occurrence of cedar pollinosis in a prospective cohort in Japan. A total of 5,698 men and 6,533 women, aged 35 to 69 at baseline in 1992, participated in the Takayama Study, a population-based prospective cohort study. Occupational history was assembled via a self-administered baseline questionnaire. To obtain information on cedar pollinosis, a follow-up questionnaire after 10 years from baseline was administered in 2002. Compared with nonfarmers, farmers had a significantly reduced risk of cedar pollinosis after controlling for covariates (hazard ratio (HR): 0.61, 95% confidence interval (CI): 0.41, 0.90 in men; and HR: 0.31, 95% CI: 0.16, 0.60 in women). There was no significant association of cedar pollinosis with other occupations except for an increased risk of pollinosis among salesmen in multivariate analyses. We observed that other occupational exposures were not associated with the onset of cedar pollinosis after adjusting by covariates, except for a decreased risk of cedar pollinosis for woodworking in men. These data suggest that exposures related to farming environment might be protective against cedar pollinosis.
    Annals of epidemiology 11/2010; 20(11):804-10. · 2.95 Impact Factor
  • Article: Dietary glycemic index, glycemic load, and intake of carbohydrate and rice in relation to risk of mortality from stroke and its subtypes in Japanese men and women.
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    ABSTRACT: We assessed the relationship of the dietary glycemic index (GI), glycemic load (GL), and intake of carbohydrate and rice, and risk of mortality from stroke and its subtypes. The cohort consisted of 12,561 men and 15,301 women residing in Takayama, Japan, in 1992. At the baseline, a food frequency questionnaire was administered; and the dietary GI, GL, and intake of carbohydrates and rice were estimated. Deaths from stroke occurring in the cohort were prospectively noted until 1999 with data from the office of the National Vital Statistics. The risk of mortality from stroke was assessed with a Cox proportional hazard model after adjusting for age; body mass index; smoking status; physical activity; history of hypertension; education; and intake of total energy, alcohol, dietary fiber, salt, and total fat. The risk of stroke subtypes was assessed in the age-adjusted model. The hazard ratios of total stroke comparing the highest vs the lowest quartiles of the dietary GI were 0.78 (95% confidence interval [CI], 0.41-1.47) with P(trend) = .50 in men and 2.09 (95% CI, 1.01-4.31) with P(trend) = .10 in women. Among women, the association was also significant with the risk of ischemic stroke (hazard ratio = 2.45; 95% CI, 1.01-5.92; P(trend) = .03); and a significant positive trend was also observed between dietary GL and mortality from hemorrhagic stroke (P(trend) = .05). The current study implies that diets with a high dietary GI increase the risk of mortality from stroke among Japanese women.
    Metabolism: clinical and experimental 03/2010; 59(11):1574-82. · 2.59 Impact Factor
  • Article: Diet based on the Japanese Food Guide Spinning Top and subsequent mortality among men and women in a general Japanese population.
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    ABSTRACT: The Japanese Food Guide Spinning Top was developed by the Japanese Ministry of Health, Labor, and Welfare and the Ministry of Agriculture, Forestry, and Fishery to promote healthful diets. Adherence to the Japanese Food Guide Spinning Top was evaluated in terms of future mortality in a prospective cohort study. A prospective cohort study among men and women in a general Japanese population. The cohort consisted of 13,355 men and 15,724 women residing in Takayama, Japan, in 1992. At baseline, a food frequency questionnaire was administered, and adherence to the food guide was measured based on consuming the recommended number of servings of grains, vegetables, fish and meat, milk, and fruits, as well as total daily energy intake and energy from snacks and alcoholic beverages. Higher scores indicated better adherence to the recommendations on a scale of 0 to 70. Based on data obtained from the Office of the National Vital Statistics, deaths occurring among members of the cohort were prospectively noted from 1992 to 1999. To assess the magnitude of association of adherence scores with subsequent mortality, a Cox proportional hazard model was applied to estimate hazard ratios (HRs) with 95% confidence intervals (CIs). Among women, the adherence score was significantly associated with a lower risk of mortality from all causes (comparing highest and lowest quartiles of the score, HR 0.78, 95% CI 0.65 to 0.94, P for trend 0.01) in a multivariate analysis; noncardiovascular, noncancer causes (HR 0.69, 95% CI 0.50 to 0.96, P for trend 0.04) and cardiovascular disease (HR 0.76, 95% CI 0.56 to 1.04, P for trend0.05). No statistically significant association was observed between the adherence score and mortality among men. The results suggest that diets based on the food guide have the benefit of reducing future mortality in women.
    Journal of the American Dietetic Association 10/2009; 109(9):1540-7. · 3.59 Impact Factor
  • Article: Consumption of coffee, green tea, oolong tea, black tea, chocolate snacks and the caffeine content in relation to risk of diabetes in Japanese men and women.
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    ABSTRACT: Although the inverse association between coffee consumption and risk of diabetes has been reported numerous times, the role of caffeine intake in this association has remained unclear. We evaluated the consumption of coffee and other beverages and food containing caffeine in relation to the incidence of diabetes. The study participants were 5897 men and 7643 women in a community-based cohort in Takayama, Japan. Consumption of coffee, green tea, oolong tea, black tea and chocolate snacks were measured with a semi-quantitative FFQ in 1992. At the follow-up survey in 2002, the development of diabetes and the time of diagnosis were reported. To assess the association, age, smoking status, BMI, physical activity, education in years, alcohol consumption, total energy intake, fat intake and women's menopausal status were adjusted. Among men who consumed one cup per month to six cups per week and among those who consumed one cup per d or more, the associated hazard ratios were 0.69 (95 % CI 0.50, 0.97) and 0.69 (95 % CI 0.49, 0.98) compared with those who drank little to no coffee, with a P value for trend of 0.32. The hazard ratios for women with the same coffee consumption patterns were 1.08 (95 % CI 0.74, 1.60) and 0.70 (95 % CI 0.44, 1.12), with a P value for trend of 0.03. The association between estimated total caffeine intake and risk of diabetes was insignificant both among men and among women. The results imply that coffee consumption decreased the risk of developing diabetes. The protective effect may exist aside from the influence of caffeine intake.
    The British journal of nutrition 10/2009; 103(3):453-9. · 3.45 Impact Factor
  • Article: Cigarette smoking and the adult onset of bronchial asthma in Japanese men and women.
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    ABSTRACT: Although smoking is a well-known risk factor for the onset of airway diseases, the associations between smoking and asthma are inconsistent. To examine the relationship of smoking in adulthood with the occurrence of asthma in Japanese individuals. A total of 6,674 men and 8,301 women from a population-based cohort in Takayama, Japan, participated in this prospective study. Information on smoking was collected via a baseline questionnaire in 1992. In 2002, development of asthma and the time of physician diagnosis were reported. During 10-year follow-up, 105 men and 92 women reported the onset of physician-diagnosed asthma. Among men, compared with never smokers, current smokers at baseline had a significantly increased risk of asthma after adjustment for covariates (hazard ratio [HR], 2.79; 95% confidence interval [CI], 1.18-6.55), whereas women with a current or former history of smoking were at an increased but not significant risk of asthma (HR, 1.18; 95% CI, 0.58-2.38). An approximately 2- to 5-fold increased risk of asthma was observed in men who smoked for more than 30 years or more than 21 cigarettes daily, with a nonsignificant linear trend, but there was no dose-response relationship in current-smoking women. Ever-smoking women with husbands who were ever smokers had a higher risk of asthma (HR, 2.02; 95% CI, 0.72-5.65) than never-smoking women with husbands who had never smoked either. These data suggest that smoking increases the risk of asthma onset in men.
    Annals of allergy, asthma & immunology: official publication of the American College of Allergy, Asthma, & Immunology 05/2009; 102(4):288-93. · 2.83 Impact Factor
  • Article: Self-reported diabetes mellitus and risk of mortality from all causes, cardiovascular disease, and cancer in Takayama: a population-based prospective cohort study in Japan.
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    ABSTRACT: Diabetes mellitus has been reported to be a major risk factor for cardiovascular disease (CVD), and higher risk of CVD among women than that among men has been observed in many studies. Further, the association of diabetes with increasing risk of cancer has also been reported. Well-designed studies conducted among men and women in the general Japanese population remain scarce. Our cohort consisted of 13355 men and 15724 women residing in Takayama, Japan, in 1992. At the baseline, the subjects reported diabetes in a questionnaire. Any deaths occurring in the cohort until 1999 were noted by using data from the Office of the National Vital Statistics. The risk of mortality was separately assessed for men and women by using a Cox proportional hazard model after adjusting for age; smoking status; body mass index (BMI); physical activity; years of education; history of hypertension; and intake of total energy, vegetables, fat, and alcohol. Diabetes significantly increased the risk of mortality from all causes [hazard ratio (HR): 1.35, 95% confidence interval (CI): 1.11-1.64] and from coronary heart disease (CHD) (HR: 2.96, 95% CI: 1.59-5.50) among men, and that from all causes (HR: 1.74, 95% CI: 1.34-2.26) and cancer (HR: 1.88, 95% CI: 1.16-3.05) among women. Diabetes was not significantly associated with mortality from CHD among women. The findings suggest that diabetes increases the risk of mortality from CVD among men and that from cancer among women. The absence of increased risk of mortality from CHD among women may suggest a particular pattern in the Japanese population.
    Journal of Epidemiology 09/2008; 18(5):197-203. · 1.86 Impact Factor
  • Article: Rationality/anti-emotionality personality and dietary habits in a community population in Japan.
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    ABSTRACT: There are no strong and consistent predictors of dietary habits although some associations have been shown with psychological factors. The purpose of the present study was to examine the relationships between the rationality and anti-emotionality (R/A) personality and dietary consumption in a Japanese community. The Takayama study is a community-based cohort study on diet and cancer in Gifu, Japan, and was initiated on September 1, 1992. Cross-sectional analyses were conducted on dietary and lifestyle data. The consumption of 169 food and beverage items was measured along with portion size by using a food frequency questionnaire. Questions regarding the R/A-personality scale and lifestyle habits were included in the questionnaire. The participants were 28077 adults (13082 males and 14995 females) aged 35 years and over. Both males and females with high R/A-personality scores (i.e., high degree of rational thought and emotional repression) consumed more soy products, green and yellow vegetables, other vegetables, and seaweed than the other participants. Males with high R/A-personality scores drank fewer alcoholic beverages, and females with high scores were found to snack less on sweet and salty foods than the other participants. Males with high R/A-personality scores showed higher consumption of meat and dairy products, and females with high scores showed higher consumption of fish, shellfish, and eggs than those with low R/A-personality scores. The R/A-personality scale may differentiate dietary habits in males and females in a Japanese community.
    Journal of Epidemiology 08/2008; 18(4):183-90. · 1.86 Impact Factor
  • Article: Soy isoflavone intake is not associated with the development of cedar pollinosis in adults.
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    ABSTRACT: Although soy isoflavone has been suggested to have both immune-enhancing and immune-suppressive effects, the effects of soy isoflavone intake on allergic disorders are unclear. A cross-sectional study indicated that a high intake of soy isoflavone is associated with a decreased risk of allergic rhinitis. We aimed to prospectively examine the relationship between soy isoflavone intake and risk of cedar pollinosis, the most common seasonal allergic rhinitis in Japan. The study was conducted in a population-based cohort of Japanese men and women. Each subject's usual diet, including soy isoflavone intake, was determined with the use of a validated FFQ in 1992. In 2002, a total of 11,229 persons who were 35-69 y old and had no history of cancer or allergic diseases at the baseline responded to a follow-up questionnaire asking about 4 symptoms related to cedar pollinosis. Cox hazard regression model was used to determine the association between soy isoflavone intake and the risk of cedar pollinosis. During the 10-y follow-up, 931 of these subjects reported that they had cedar pollinosis. There was no significant association between soy isoflavone intake and risk of cedar pollinosis in men and women after controlling for covariates. For the highest compared with the lowest quartile of soy isoflavone intake, hazard ratios were 1.07 (95% CI: 0.81-1.42) in men and 0.89 (95% CI: 0.68-1.15) in women. These data did not support an association between soy isoflavone intake and risk of cedar pollinosis.
    Journal of Nutrition 08/2008; 138(7):1372-6. · 3.92 Impact Factor
  • Article: Fruit and vegetable intake and mortality from cardiovascular disease are inversely associated in Japanese women but not in men.
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    ABSTRACT: Some epidemiological studies undertaken in Western countries have demonstrated that high intake of fruit and vegetables results in decreased risk of cardiovascular disease (CVD). The objective of this study was to examine the hypothesis that high intake of fruit and vegetables lowers CVD mortality in a population-based cohort of Japanese subjects. In 1992, fruit and vegetable intake was assessed in 13,355 men and 15,724 women in Takayama, Gifu, Japan using a validated FFQ. During the follow-up (1992-99), 200 men and 184 women died from CVD. For women, the highest quartile of vegetable intake compared with the lowest was marginally significant and inversely associated with CVD mortality after adjusting for total energy, age, and nondietary and dietary covariates [hazard ratio (HR) = 0.62; 95% CI, 0.36-1.08; P-trend = 0.007]. An inverse trend with borderline significance was also observed in fruit intake, excluding CVD deaths in the first 2 y of this study, after adjusting for the above-mentioned covariates (HR = 0.83; 95% CI, 0.51-1.34; P-trend = 0.10). In men, CVD death was not associated with fruit (HR = 1.16; 95% Cl, 0.77-1.74; P-trend = 0.61) and vegetable (HR = 0.81, 95% CI: 0.49-1.34; P-trend = 0.47) intake. These data suggest that higher intake of vegetables is associated with reduced risk of death from CVD for women.
    Journal of Nutrition 07/2008; 138(6):1129-34. · 3.92 Impact Factor
  • Article: Causal attributions to epidemiological risk factors and their associations to later psychological adjustment among Japanese breast cancer patients.
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    ABSTRACT: The objective of this study was to evaluate the causal attributions for breast cancer and their association with the subsequent psychological adjustment. Sixty-three Japanese patients newly diagnosed with breast cancer were asked by an interviewer about risk factors and explanations for the etiology of breast cancer using a four-point scale. The General Health Questionnaire (GHQ-28) and the Center for Epidemiologic Studies Depression Scale (CES-D) were administered about 2 months later to measure psychological adjustment to the illness. The relationship between each causal attribution and measure of psychological adjustment was assessed with the Spearman rank correlation after adjusting for potential confounders (age, marital status, cancer stage at diagnosis, time between the day of diagnosis and follow-up, and physical symptoms at the follow-up). Attributions to several explanations, including "stress" and "personal characteristics," were positively associated with the GHQ-28 measures. Of the attributions to risk factors, "body size" was significantly inversely (r = -0.29) associated and "never having children" was insignificantly and highly inversely (r = -0.77) associated with the GHQ-28 measures, indicating better adjustment to the illness. On the other hand, the attribution to "tobacco" was significantly and positively associated with the GHQ-28 measures (r = 0.34), indicating that the attributions antagonized adjustment to the illness. The current study indicates that forming causal attributions influences the adjustment to the illness in Japanese breast cancer patients and attributions to certain risk factors for breast cancer may contribute to better adjustment.
    Supportive Care Cancer 05/2008; 17(1):3-9. · 2.60 Impact Factor
  • Article: Smoking and risk of cedar pollinosis in Japanese men and women.
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    ABSTRACT: Pollinosis induced by the cedar pollen antigen is the most common seasonal allergic reaction in Japan. We aimed to examine the relationship between smoking and risk of cedar pollinosis in a population-based cohort of the Japanese. Study subjects were 12,221 men and women from the Takayama Study cohort who were 35-69 years old at enrollment in 1992. A follow-up survey in 2002 was used to obtain information about four symptoms related to cedar pollinosis. A total of 1,000 subjects had cedar pollinosis during the 10-year follow-up. As compared with those who had never smoked, current smokers at the baseline were at a significantly decreased risk of cedar pollinosis after controlling for covariates in men (hazard ratio [HR]: 0.64, 95% CI: 0.50-0.83) as well as in women (HR: 0.64, 95% CI: 0.47-0.88). There was a significant dose-response relationship between the risk of cedar pollinosis and the number of cigarettes smoked each day as well as with the number of years an individual had smoked. A significant risk reduction was observed among men and women who had continued to smoke cigarettes during the follow-up period in comparison with those who had never smoked. There was no risk increase for former smokers at the baseline as well as for those who quit smoking during the follow-up. Some components of tobacco may protect against cedar pollinosis. Our finding could provide clues about therapeutic strategies for protection against cedar pollinosis.
    International Archives of Allergy and Immunology 01/2008; 147(2):117-24. · 2.40 Impact Factor
  • Article: Prospective cohort study of body mass index in adolescence and death from stomach cancer in Japan.
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    ABSTRACT: We investigated the association between body mass index (BMI) values and the risk of death from stomach cancer later in life. From 1992 to 2000, 28 443 participants (13 211 men and 15 232 women) were followed, and 129 deaths from stomach cancer (86 men and 43 women) occurred. BMI (BMI at the baseline) and BMI(20y) (BMI at age 20 years) were obtained by questionnaire at the beginning of the study. Men in the middle and highest tertiles of BMI(20y) had a higher risk of death from stomach cancer than those in the lowest tertile (after controlling for covariates, hazard ratio [HR] = 2.73 with 95% confidence interval [CI] 1.26-5.89 for the middle tertile; HR = 2.15 with 95% CI 0.97-4.73 for the highest tertile), although there was no significant trend (P = 0.30). Likewise, women in the middle and highest tertiles of BMI(20y) had an increased risk of death from stomach cancer (HR = 5.17 with 95% CI 1.50-17.87 for the middle tertile; HR = 4.22 with 95% CI 1.18-15.05 for the highest tertile; P for trend = 0.05). The analysis of BMI at the baseline did not show a significant relationship with the risk of death from stomach cancer. These results suggest that a high BMI(20y) is associated with an increased risk of death from stomach cancer.
    Cancer Science 12/2007; 98(11):1785-9. · 3.33 Impact Factor
  • Article: Sodium intake and risk of death from stroke in Japanese men and women.
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    ABSTRACT: Despite the evidence for a positive association of dietary salt and blood pressure, the few prospective studies that have assessed the association between dietary salt and stroke have reported inconsistent results. The purpose of this study was to examine the relation between sodium intake and death from stroke in a population-based cohort of Japanese men and women. In 1992, usual diet including sodium intake was determined in 13 355 men and 15 724 women in Takayama City, Gifu, with the use of a validated food frequency questionnaire. There were 269 stroke deaths (137 men and 132 women) between baseline and 1999. In men, the highest compared with the lowest tertile of sodium intake was significantly positively associated with death from total stroke after controlling for covariates (hazard ratio [HR]), 2.33; 95% CI, 1.23 to 4.45). Significantly positive associations were also observed between sodium intake and death from ischemic stroke (HR, 3.22; 95% CI, 1.22 to 8.53) as well as death from intracerebral hemorrhage (HR, 3.85; 95% CI, 1.16 to 12.7). A positive association between sodium intake and death from stroke in women was suggested, although the associations for total stroke and ischemic stroke were of borderline significance (HR, 1.70; 95% CI, 0.96 to 3.02 and HR, 2.10; 95% CI, 0.96 to 4.62, respectively). These prospective data support the hypothesis that dietary salt increases the risk of death from stroke.
    Stroke 08/2004; 35(7):1543-7. · 5.73 Impact Factor
  • Source
    Article: Sleep disturbance and onset of type 2 diabetes.
    Norito Kawakami, Naoyoshi Takatsuka, Hiroyuki Shimizu
    Diabetes Care 02/2004; 27(1):282-3. · 8.09 Impact Factor
  • Article: The relationships of a rationality/antiemotionality personality scale to mortalities of cancer and cardiovascular disease in a community population in Japan.
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    ABSTRACT: Grossarth-Maticek et al. reported that an individual's level on a rationality/antiemotionality (R/A) personality was strongly predictive of cancer, ischemic heart disease and stroke mortality. To investigate the relationships of an individual's level on the R/A personality to cancer and cardiovascular disease mortality in Japan, we conducted a population-based cohort study. A self-administered questionnaire was distributed to 36990 Japanese residents in September 1992. The response rate was 90.3%. Data from 13226 males and 14880 females were analyzed. Dates and causes of death through December 31, 1999 were obtained for deceased participants. The results from multivariate hazard ratios (HRs) revealed that males scoring in the middle level compared to those scoring in the lower level of the R/A personality scale decreased their risk of death from cancer and cardiovascular diseases after controlling for covariates. The level on the R/A personality scale may affect mortality from cancer and cardiovascular diseases differently in Japan.
    Journal of Psychosomatic Research 02/2004; 56(1):103-11. · 3.30 Impact Factor
  • Article: The impact of changes in marital status on the mortality of elderly Japanese.
    Chisato Nagata, Naoyoshi Takatsuka, Hiroyuki Shimizu
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    ABSTRACT: To assess the impact of changes in marital status on the mortality of elderly Japanese men and women. In a baseline survey conducted in 1992, 2039 male and 1466 female residents in Takayama City, Gifu, who were married and aged 65 years or over responded to a detailed health and lifestyle questionnaire. Information regarding deaths of subjects and their spouses, the causes of death, and whether the subjects and spouses moved away from the city between 1992 and 1999 was obtained from the National Vital Statistics and the residential registers of the city. A proportional hazard model was used including marital status as time- varying independent variable. During the study period, six men and two women became separated/divorced and 151 men and 448 women became widowed. Widowhood was not significantly associated with mortality in men. Duration of widowhood was significantly inversely associated with mortality in women (p = 0.04). A significant decreased hazard ratio (=0.40, p = 0.04) was observed for women widowed for 3 years or more. We found no evidence indicating that widowed men and women have an increased mortality rate. Instead, the data suggested a decreased mortality rate among long-term widowed women.
    Annals of Epidemiology 05/2003; 13(4):218-22. · 3.21 Impact Factor
  • Article: Soy and fish oil intake and mortality in a Japanese community.
    Chisato Nagata, Naoyoshi Takatsuka, Hiroyuki Shimizu
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    ABSTRACT: The relation between intake of fish and soy products and subsequent all-cause and cause-specific mortality was examined in a cohort of 13,355 male and 15,724 female residents of Takayama, Gifu, Japan. A diet that included soy and fish intake was assessed in 1992 by using a validated semiquantitative food frequency questionnaire. Over 7 years of follow-up, 2,062 participants (1,163 men and 899 women) died. For men, the highest compared with the lowest quintile of total soy product intake was marginally significantly inversely associated with total mortality after adjustment for total energy and nondietary covariates (hazard ratio = 0.83, 95% confidence interval: 0.69, 1.01; p for trend = 0.07). After adjustment for nondietary covariates, a decreased hazard ratio for the highest compared with the lowest quintile of total soy product intake was also observed for women (hazard ratio = 0.83, 95% confidence interval: 0.68, 1.02; p for trend = 0.04). Additional adjustment for dietary factors significantly associated with total mortality did not attenuate these associations. For women but not for men, n-3 fatty acids from fish were significantly inversely associated with total mortality. Results showed that soy intake may have moderate but beneficial effects on total mortality.
    American Journal of Epidemiology 12/2002; 156(9):824-31. · 5.22 Impact Factor