[Show abstract][Hide abstract] ABSTRACT: Parent and child perceived neighborhood safety predicts child health outcomes such as sleep quality, asthma, physical activity, and psychological distress. Although previous studies identify environmental predictors of parent perceived safety, little is known about predictors of child perceived safety. This study aims to identify the social and physical environmental neighborhood features that predict child and parent perceived neighborhood safety and, simultaneously, to assess the association between child and parent perceptions. Data were from the QUebec Adipose and Lifestyle InvesTigation in Youth (QUALITY) cohort, an ongoing study of Caucasian children (aged 8–10 years) with a parental history of obesity, and their biological parents from Québec, Canada. Measures of social and physical neighborhood features were collected using a spatial data infrastructure and in-person audits. Structural equation modeling was used to test direct and indirect associations between neighborhood features, child and parent perceived safety. Results suggest that among children (N = 494), trees and lighting were positively associated with perceived neighborhood safety, whereas a high proportion of visible minorities was associated with poorer perceived safety. Parents’ perceptions of safety were more strongly tied to indicators of disorder and a lack of community involvement, and to traffic. Child perceived safety was partly explained by parent perceived safety, suggesting moderate concordance between perceptions. Although associated with each other, parent and child perceived safety seemed to be determined by distinct environmental features. Though this study focused on determinants of child and parent perceived safety, future research investigating the impact of neighborhood safety on child health should consider both child and parent perspectives.
Journal of Urban Health 12/2014; · 1.89 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Although disadvantaged youth are more likely to be victimized at school, victimization only partly explains their decreased feelings of safety at school. We applied a socioecological approach to test the hypotheses that the experience of poverty is associated with decreased feelings of safety at school, and that residential neighborhood features partly mediate the relationship between poverty and feeling less safe at school. This study draws on the Québec Longitudinal Study of Child Development (QLSCD) which began in 1998 with a representative population-based cohort of 2,120 5-month old infants (49.1 % female) and their primary caregiver. The study also includes measures of ego-centred residential neighborhood exposures (based on a 500 m circular buffer zone surrounding the family's residential postal code) derived from a spatial data infrastructure. We used latent growth modeling to estimate youth's family poverty trajectory from age 5 months to 13 years, and structural equation modeling to test our hypotheses. The results suggest that youth experiencing chronic and later-childhood poverty felt less safe at school in part because they lived in neighborhoods that their parents described as being disorderly (e.g., demarked by the presence of garbage, drug use and groups of trouble-makers). These neighborhoods also tended to have less greenery (e.g., trees, parks) and more lone-parent households. Neighborhood features did not help explain the relationship between early-childhood poverty and feeling less safe at school. The findings suggest that targeting residential neighborhood features such as greenery and disorder could improve youth's felt safety at school, particularly for those experiencing chronic and later-childhood poverty.
[Show abstract][Hide abstract] ABSTRACT: Background
Two thirds of the U.S. population is overweight or obese, but those living in poverty are disproportionately affected. Although 30%−50% of Americans report currently trying to lose weight, some strategies may be counterproductive. Little is known about how income may be associated with weight-loss strategies.
This study aims to determine the association between income and weight-loss strategies in the general U.S. population.
Cross-sectional data from the National Health and Nutrition Examination Survey were collected in 1999−2010 and analyzed in 2012. Annual household income was categorized as <$20,000, $20,000−$44,999, $45,000−$74,999, ≥$75,000 (ref). Analyses were stratified by age (youth: aged 8−19 years, n=3,184; adults: aged ≥20 years, n=5,643) and included sampling weights. Multivariable logistic regression assessed the likelihood of using specific strategies and utilizing strategies consistent with recommendations (such as exercising or reducing fat or sweets) and inconsistent (such as skipping meals or fasting) and adjusted for gender, age, ethnicity, and whether the person was overweight or obese. Analyses among adults were also adjusted for marital status and education.
Compared to the ref, both youth and adults with household income <$20,000/year were 33% (95% CI=0.5, 0.9) and 50% (95% CI=0.4, 0.6) less likely to use strategies consistent with recommendations to lose weight, respectively. Youth from households with income <$20,000/year were 2.5 times (95% CI=1.8, 3.5) more likely to use inconsistent strategies, but this association was not observed among adults.
Stronger efforts to emphasize weight-loss strategies consistent with recommendations and the distinction between consistent and inconsistent strategies are needed, especially among lower socioeconomic groups.
American Journal of Preventive Medicine 06/2014; 46(6):585–592. · 3.95 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Identification of factors that relate to physical activity behavior in children at higher risk for weight problems--namely, children with obese parents--is key to informing the development of effective interventions to promote physical activity and reduce obesity. The purpose of our study was to examine children's perceptions of parental social support for physical activity and the associations between these perceptions and health-enhancing physical activity behavior. Our specific objectives were to: (a) compare perceptions of parental support in children across gender and weight status; (b) compare perceptions of support across source (mother, father) and type (tangible, intangible) in normal-weight and overweight girls and boys; and (c) examine the associations between perceptions of parental support and moderate-to-vigorous physical activity (MVPA) behavior.
Research quarterly for exercise and sport 06/2014; 85(2):198-207. · 1.11 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: This study examined (1) the factor structure of a depressive symptoms scale (DSS), (2) the sex and longitudinal invariance of the DSS, and (3) the predictive validity of the DSS scale during adolescence in terms of predicting depression and anxiety symptoms in early adulthood.
Data were drawn from the Nicotine Dependence in Teens (NDIT) study, an ongoing prospective cohort study of 1,293 adolescents.
The analytical sample included 527 participants who provided complete data or had minimal missing data over follow-up. Confirmatory factor analysis revealed that an intercorrelated three-factor model with somatic, depressive, and anxiety factors provided the best fit. Further, this model was invariant across sex and time. Finally, DSS scores at Time 3 correlated significantly with depressive and anxiety symptoms measured at Time 4.
Results suggest that the DSS is multidimensional and that it is a suitable instrument to examine sex differences in somatic, depressive, and anxiety symptoms, as well as changes in these symptoms over time in adolescents. In addition, it could be used to identify individuals at-risk of psychopathology during early adulthood.
[Show abstract][Hide abstract] ABSTRACT: Skateboarding is considered to be a high risk activity. Although many studies have identified risk factors associated with skateboarding injuries, few have provided detailed in-depth knowledge on participants’ psychological dispositions towards risk behaviors. The aim of this study was to identify individual factors associated with risk perception and risk-taking among skateboarders. Telephone interviews were conducted with 158 skateboarders (mean age = 18.1 years) recruited in 11 Montreal skateparks. Age, self-efficacy, previous injuries, fear of being injured, sensation seeking and experience level were all included in two linear regression models that were run for risk perception and risk-taking. Age, experience level, sensation seeking, and risk perception are significant explanatory variables of risk-taking. Results show that sensation seeking was the only significant factor associated with risk perception. These results allow for a better understanding of the behavior of skateboarders, they highlight the importance of impulsive sensation seeking in risk perception as well as risk-taking. This study characterizes skateboarders who take risks and provides additional information on interventions for injury prevention.
[Show abstract][Hide abstract] ABSTRACT: Objectives: To determine the independent associations of moderate to vigorous physical activity (MVPA), fitness, screen time, and adiposity with insulin secretion in children. Design and Methods: Caucasian youth (n= 423/630), 8 to 10 years old, with at least one obese biological parent, were studied (QUALITY cohort). Insulin secretion was measured using HOMA2-%B, area under the curve (AUC) of insulin to glucose over the first 30 minutes (AUC I/Gt30min ) of the OGTT and AUC I/Gt120min over 2 hours. Fitness was measured by VO2peak ; percent fat mass (PFM) by DXA; 7-day MVPA by accelerometry; self-reported screen time included television, video game or computer use. Models were adjusted for age, sex, season, puberty, PFM and insulin sensitivity [IS] (HOMA2-IS, Matsuda-ISI). Results: PFM was strongly associated with insulin secretion, even after adjustment for IS: for every 1% increase in PFM, insulin secretion increased from 0.3 to 0.8% across indices. MVPA was negatively associated with HOMA2-%B (p<0.05), but not with OGTT-derived measures. Fitness was negatively associated with AUC I/Gt120min (p<0.05). Screen time showed a trend toward higher HOMA2-%B in girls (p=0.060). Conclusions: In children with an obese parent, lower insulin secretion is associated with lower adiposity, higher MVPA, better fitness and possibly reduced screen time.
[Show abstract][Hide abstract] ABSTRACT: Findings from prospective studies on associations between physical activity and adiposity among youth are inconsistent. Our aim was to describe physical activity trajectories during secondary school and examine the association with change in adiposity in youth.
Physical activity was measured in 20 survey cycles from 1999 to 2005; anthropometrics were measured in survey cycles 1, 12, and 19. Individual growth curves modeling moderate-to-vigorous physical activity (MVPA) and vigorous physical activity (VPA) were estimated. Estimates of initial level and rate of decline in MVPA and VPA bouts per week were included as potential predictors of body fat% and body mass index using age- and sex-specific linear regression.
Complete data were available for 840 and 760 adolescents aged 12-13 years at baseline, followed from survey cycles 1-12 and 12-19, respectively. Among girls, yearly declines of one MVPA and one VPA bout per week during earlier adolescence were associated with increases of 0.19 (95% confidence interval [CI], 0.02-0.36) and 0.47 (95% CI, 0.015-0.92) units of body fat%, respectively. In boys, a yearly decline of one MVPA bout per week was associated with an increase of 0.38 (95% CI, 0.05-0.70) units of body fat% during later adolescence.
Obesity prevention programs should include strategies to prevent declines in physical activity.
Annals of epidemiology 09/2013; 23(9):529-33. · 2.95 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Background.Using a large population-based sample, this study aims to verify whether televiewing at 29 months, a common early childhood pastime, is prospectively associated with school readiness at 65 months.Methods.Participants are a prospective-longitudinal cohort of 991 girls and 1006 boys from the Quebec Longitudinal Study of Child Development with parent-reported data on weekly hours of televiewing at 29 months of age. We conducted a series of ordinary least-squares regressions in which children's scores on direct child assessments of vocabulary, mathematical knowledge, and motor skills, and kindergarten teacher-reports of socioemotional functioning were linearly regressed on early TV viewing.Results.Every standard deviation increase (1.2 hours) in daily televiewing at 29 months predicted decreases in receptive vocabulary, number knowledge scores, classroom engagement, and gross motor locomotion scores, and increases in the of frequency of victimization by classmates.Conclusions.Increases in total time watching television at 29 months was associated with subsequent decreases in vocabulary and math skills, classroom engagement (which is largely determined by attention skills), victimization by classmates, and physical prowess at kindergarten. These prospective associations, independent of key potential confounders, suggest the need for better parental awareness and compliance with existing viewing recommendations put forth by the American Academy of Pediatrics.Pediatric Research (2013); doi:10.1038/pr.2013.105.
[Show abstract][Hide abstract] ABSTRACT: Objective:To examine associations between characteristics of neighborhood built and social environments and likelihood of obesity among family triads living at the same residential address and to explore whether these associations differ between family members.Methods:Data were from the baseline wave of QUALITY (Quebec Adipose and Lifestyle Investigation in Youth), an ongoing study on the natural history of obesity in 630 Quebec youth aged 8-10 years with a parental history of obesity. Weight and height were measured in children and both biological parents and body mass index (BMI) was computed. Residential neighbourhood environments were characterised using a Geographic Information System and in-person neighbourhood audits. Principal components analysis allowed for identification of overarching neighbourhood indicators including poverty, prestige, level of urbanicity, traffic, physical disorder and deterioration, and pedestrian friendliness. Multilevel logistic regressions were used to examine associations between neighbourhood indicators and obesity within multiple family members residing at the same address while controlling for household-level sociodemographic variables.Results:A total of 417 families were included in analyses. Families residing in lower and average prestige neighborhoods were more likely to be obese (OR=1.69, 95% CI: 1.16, 2.44, and OR=1.52, 95% CI: 1.09, 2.12, respectively) than those residing in higher prestige neighborhoods. Residing in lower traffic neighborhoods was associated with less obesity (OR=0.70, 95% CI: 0.50, 0.96). Other neighborhood indicators may have differential effects across family members. For example, as neighborhood poverty increased, obesity was more likely among children but less likely among fathers and no different for mothers.Conclusion:Findings indicate that some shared neighborhood exposures are associated with greater risk of obesity for entire families whereas other exposures may heighten obesity risk in some but not all family members. Patterns may reflect differences in the way in which family members use residential neighborhood environments.International Journal of Obesity accepted article preview online, 21 May 2013; doi:10.1038/ijo.2013.81.
International journal of obesity (2005) 05/2013; · 5.22 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: This study describes developmental trajectories of depressive symptoms in adolescents and examines the association between trajectory group and mental health outcomes in young adulthood.
Depressive symptoms were self-reported every three months from grade seven through grade 11 by 1293 adolescents in the Nicotine Dependence in Teens (NDIT) study and followed in young adulthood (average age 20.4, SD=0.7, n=865). Semi-parametric growth modeling was used to identify sex-specific trajectories of depressive symptoms.
THREE DISTINCT TRAJECTORY GROUPS WERE IDENTIFIED: 50% of boys and 29% of girls exhibited low, decreasing levels of depressive symptoms; 14% of boys and 28% of girls exhibited high and increasing levels; and 36% of boys and 43% of girls exhibited moderate levels with linear increase. Trajectory group was a statistically significant independent predictor of depression, stress, and self-rated mental health in young adulthood in boys and girls. Boys, but not girls, in the high trajectory group had a statistically significant increase in the likelihood of seeking psychiatric care.
Substantial heterogeneity in changes in depressive symptoms over time was found. Because early depressive symptoms predict mental health problems in young adulthood, monitoring adolescents for depressive symptoms may help identify those most at risk and in need of intervention.
Journal of the Canadian Academy of Child and Adolescent Psychiatry = Journal de l'Academie canadienne de psychiatrie de l'enfant et de l'adolescent 05/2013; 22(2):96-105.
[Show abstract][Hide abstract] ABSTRACT: Purpose: Taking advantage of a natural experiment made possible by the placement of health-promoting vending machines (HPVMs), we evaluated the impact of the intervention on consumers' attitudes toward and practices with vending machines in a pediatric hospital. Methods: Vending machines offering healthy snacks, meals, and beverages were developed to replace four vending machines offering the usual high-energy, low-nutrition fare. A pre- and post-intervention evaluation design was used; data were collected through exit surveys and six-week follow-up telephone surveys among potential vending machine users before (n=293) and after (n=226) placement of HPVMs. Chi-2 statistics were used to compare pre- and post-intervention participants' responses. Results: More than 90% of pre- and post-intervention participants were satisfied with their purchase. Post-intervention participants were more likely to state that nutritional content and appropriateness of portion size were elements that influenced their purchase. Overall, post-intervention participants were more likely than pre-intervention participants to perceive as healthy the options offered by the hospital vending machines. Thirty-three percent of post-intervention participants recalled two or more sources of information integrated in the HPVM concept. No differences were found between pre- and post-intervention participants' readiness to adopt healthy diets. Conclusions: While the HPVM project had challenges as well as strengths, vending machines offering healthy snacks are feasible in hospital settings.
Canadian Journal of Dietetic Practice and Research 03/2013; 74(1):28-34. · 0.52 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: To examine the associations among birth weight, infant growth and childhood adiposity, and to test whether parental weight status modifies these associations.
The sample was comprised of 423 participants born at term who were an appropriate size for their gestational age from the Quebec Adipose and Lifestyle Investigation in Youth (QUALITY) study, a cohort of 630 children with a parental history of obesity. Infant growth velocity from zero to two years of age was estimated using slopes from simple linear regression for weight and body mass index (BMI) Z-scores. Child anthropometrics and body composition, and parental BMI were measured from eight to 10 years of age. Associations were modelled using multiple linear regressions.
Increased birth weight and growth velocity independently predicted increased childhood adiposity. Effects of infant growth velocity on later adiposity were stronger with higher maternal BMI but not with higher paternal BMI. Similar interactions with birth weight were not found.
Early childhood measures of growth and the mother's BMI score should be included in investigations on obesity risk.
Paediatrics & child health 02/2013; 18(2):e2-9. · 1.03 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: PURPOSE: The objectives of this study were to assess (1) the longitudinal associations of past moderate-to-vigorous physical activity (MVPA) and involvement in team sports during secondary school with depressive symptoms in early adulthood, and (2) the cross-sectional associations of current MVPA and involvement in team sports with depressive symptoms during young adulthood. METHODS: Data were drawn from the Nicotine Dependence in Teens study, which is an ongoing prospective cohort study of 1293 adolescents aged 12-13 years at baseline (52% female). Data analyses involved latent growth curve modeling and multiple hierarchical linear regression models. RESULTS: Current MVPA (β = -0.12), but not past MVPA, participation was significantly negatively related to depressive symptoms during young adulthood (P < .05). Both current and past involvement in team sports were significantly negatively related to depressive symptoms (β ≥ -0.09; P < .05); however, these associations were no longer significant (P = .08) when covariates were controlled for. CONCLUSIONS: Findings provide insight about the unique associations between the timing and type of physical activity and depressive symptoms, suggesting that physical activity within team sport contexts should be encouraged so that young adults may experience less depressive symptoms.
Annals of epidemiology 01/2013; 23(1):25-30. · 2.95 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: OBJECTIVE: Examine depressive symptom trajectories during adolescence as predictors of physical activity (PA) in young adulthood. METHODS: Adolescents residing in Montreal, Canada (n=860) reported their depressive symptoms every 3-4months during high school in 20 data collections. Three years later, participants reported engaging in moderate and vigorous intensity PA and team sports participation. Trajectories of depressive symptoms were estimated using latent growth modeling and examined as predictors of PA outcomes. RESULTS: Three depression symptoms trajectory groups were identified during adolescence: low and declining depressive symptom scores (group 1; 37.8%); moderate and stable depressive symptom scores (group 2; 41.6%); and high increasing depressive symptom scores (group 3; 20.6%). In multivariable analyses, group 2 and group 3 participated in less moderate-intensity PA and were less likely to participate in team sports compared to group 1. CONCLUSIONS: The importance of examining intensity and type of PA as outcomes of depressive symptoms is highlighted. Targeted approaches are needed to encourage adolescents with moderate to high depression symptoms to engage in PA and team sports to improve their health and wellbeing.
Preventive Medicine 01/2013; 56(2):95-98. · 3.50 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: In utero exposure to cigarette smoke has been shown to have an adverse effect on healthy brain development in childhood. In the present study, we examine whether fetal exposure to mild and heavy smoking is associated with lower levels of impulsivity and cognitive control at age 10. Using a sample of 2120 children from the Québec Longitudinal Study of Child Development, we examine the association between gestational cigarette smoke exposure and fourth grade teacher reports of impulsivity and classroom engagement which represent behavioral indicators of executive functions. When compared to children of non-smokers, children of mothers who reported smoking heavily during pregnancy (10 or more cigarettes per day) were rated by their fourth grade teachers as displaying higher levels of impulsive behavior, scoring .112 standard deviation units higher than children of non-smokers. Children of mothers who smoked heavily were also less engaged in the classroom, scoring .057 standard deviation units lower than children of women who did not smoke. These analyses were adjusted for many potentially confounding child and family variables. Exposure to perinatal nicotine may compromise subsequent brain development. In particular, fetal nicotine may be associated with impairment in areas recruited for the effortful control of behavior in later childhood, a time when task-orientation and industriousness are imperative for academic success.
International journal of psychophysiology: official journal of the International Organization of Psychophysiology 12/2012; · 3.05 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Purpose: To describe developmental trajectories of depressive symptoms in adolescents and to examine the association between trajectory group and mental health outcomes in young adulthood. Methods: Depressive symptoms were self-reported every three months from grade 7 through grade 11 by 1293 adolescents in the Nicotine Dependence in Teens (NDIT) study. A post-secondary school survey was administered in young adulthood (average age 20.4 years, SD=0.7, n=865). Semi-parametric growth modeling was used to identify sex specific trajectories of depressive symptoms. Results: The best-fitting model for both boys and girls included three distinct trajectory groups. Fifty percent of boys and 29% of girls exhibited low and decreasing levels of depressive symptoms; 14% of boys and 28% of girls exhibited high and increasing levels of depressive symptoms. Trajectory group was a statistically significant predictor of depression, stress, and self-rated mental health in young adulthood in boys and girls. Boys, but not girls, with high and increasing levels had a statistically significant increase in the likelihood of seeking psychiatric care. Conclusions: In contrast to examining mean scores, the trajectory approach identified a substantial percentage of both boys and girls with decreasing depressive symptoms scores during adolescence. Because early depressive symptoms predict mental health problems in young adulthood, monitoring adolescents for depressive symptoms may help identify those most at risk and in need of intervention.
140st APHA Annual Meeting and Exposition 2012; 10/2012
[Show abstract][Hide abstract] ABSTRACT: BACKGROUND: The relationship between early childhood television viewing and physical fitness in school age children has not been extensively studied using objective outcome measures. METHODS: Using a sample of 1314 children from the Quebec Longitudinal Study of Child Development, we examine the association between parental reports of weekly hours of television viewing, assessed at 29 and 53 months of age, and direct measures of second grade muscular fitness using performances on the standing long jump test (SLJ) and fourth grade waist circumference. RESULTS: Controlling for many potentially confounding child and family variables, each hour per week of television watched at 29 months corresponded to a .361 cm decrease in SLJ, 95% CI between -.576 and -.145. A one hour increase in average weekly television exposure from 29 to 53 months was associated with a further .285 cm reduction in SLJ test performance, 95% CI between -.436 and -.134 cm and corresponded to a .047 cm increase in waistline circumference, 95% CI between .001 and .094 cm. Interpretation Watching television excessively in early childhood, may eventually compromise muscular fitness and waist circumference in children as they approach pubertal age.
International Journal of Behavioral Nutrition and Physical Activity 07/2012; 9(1):87. · 3.58 Impact Factor