Just because you can does not mean you should: an examination of efficacy and potential harms from non-prescribed supplements taken by members of the Christchurch Health and Development Study at age 40.

Nil.

The association between alcohol use disorder and suicidal ideation in a New Zealand birth cohort.

BACKGROUND: Alcohol use disorder is associated with increased suicide risk; however, both alcohol use disorder and suicide share risk factors which must be accounted for in order to understand this relationship. This study aimed to explore the longitudinal relationship between alcohol use disorder and suicidal ideation in adulthood, while accounting for both child background and adult covariate factors. METHOD: Data were collected from the Christchurch Health and Development Study, a birth cohort of 1265 children born in Christchurch (New Zealand) in mid-1977. Alcohol use disorder (operationalised as alcohol abuse and alcohol dependence) was quantified between age 18 and 40 in five data waves. The outcome measure suicidal ideation was reported over the same time periods. Childhood confounding variables were controlled for, as well as time-dynamic covariates collected in adulthood, including internalising disorders, distress due to relationship dissolutions and other substance use disorders. RESULTS: The association between alcohol abuse and suicidal ideation was not statistically significant before or after adjusting for childhood confounding and adulthood covariate factors, when compared to no alcohol disorder. However, the association between alcohol dependence and suicidal ideation was significant both before and after adjustment (unadjusted odds ratio = 2.89, 95% confidence interval = [2.09, 3.99]; adjusted odds ratio = 1.52, 95% confidence interval = [1.04, 2.23]), when compared to no alcohol disorder. Furthermore, alcohol dependence remained significant when compared to alcohol abuse (unadjusted odds ratio = 2.33, 95% confidence interval = [1.61, 3.37]; adjusted odds ratio = 1.54, 95% confidence interval = [1.00, 2.37]). CONCLUSION: This analysis found an association between alcohol dependence and suicidal ideation within a New Zealand birth cohort, which persists even after adjustment for childhood confounding and adulthood covariate factors. Given the high rates of suicide and heavy drinking within the New Zealand population, any comprehensive national or regional suicide prevention plan should seek to reduce risky alcohol consumption at an individual and population level, as this represents a modifiable risk factor for suicide.

Parental use of physical punishment in a birth cohort.

AIM: To document the prevalence of child physical punishment by parents and associated predictors in the Christchurch Health and Development Study (CHDS) birth cohort over a 15-year period. METHOD: A cohort of 1,265 CHDS individuals were followed from birth (1977) to age 40 years. At ages 25 (n=155), 30 (n=337), 35 (n=585) and 40 years (n=636), the cohort members with dependent children (<16 years of age) were interviewed about their use of child physical punishment in the past 12 months using the Parent-Child Conflict Tactics Scale. Parent, child and family predictors were also examined. RESULTS: The most common forms of physical punishment were smacking on bottom and slapping on hand, arm or leg. Rates of all forms of physical punishment declined with age, ranging from 77% reporting any physical punishment at age 25 to 42% at age 40. In multivariable models, significant predictors included parental age, numbers/ages of children in the household, childhood family socioeconomic status, parental history of adolescent mental health problems and concurrent intimate partner violence. CONCLUSION: Use of physical punishment remains a relatively common form of child discipline despite the 2007 anti-smacking legislation and reduced public tolerance for physical violence towards children. Implications for prevention/intervention are discussed.

Social Causation, Social Selection, or Common Determinants? Examining Competing Explanations for the Link Between Young Adult Unemployment and Nicotine Dependence.

INTRODUCTION: Unemployment has been related to smoking, yet the causal nature of the association is subject to continued debate. Social causation argues that unemployment triggers changes in smoking, whereas the social selection hypothesis proposes that pre-existing smoking behavior lowers the probability of maintaining employment. The present study tested these competing explanations while accounting for another alternative explanation-common liability. METHODS: Data were from the Christchurch Health and Development Study, a longitudinal cohort followed from birth to age 35. Odds were generated for having nicotine dependence in models for social causation and being unemployed in models for social selection. These models were extended to include possible common liability factors during childhood (eg, novelty seeking) and young adulthood (eg, major depression). RESULTS: In the model testing social causation, coefficients representing the impacts of unemployment on nicotine dependence remained statistically significant and robust (odds ratio [OR] = 1.55; 95% confidence interval [CI] = 1.20, 2.00), even after accounting for common determinant measures. In contrast, a reverse social selection model revealed that coefficients representing the impacts of nicotine dependence on unemployment substantially attenuated and became statistically nonsignificant as childhood factors were added (OR = 1.14; 95% CI = 0.90, 1.45). CONCLUSIONS: Unemployment may serve as inroads to nicotine addiction among young adults, not the other way, even in the context of nicotine dependence, a more impaired form of smoking that may arguably hold higher potential to generate social selection processes. This social causation process cannot be completely attributable to common determinant factors. IMPLICATIONS: It is critical to clarify whether unemployment triggers changes in smoking behaviors (ie, social causation) or vice versa (ie, social selection)-the answers to the question will lead to public health strategies with very different intervention targets to break the linkage. The current study findings favor social causation over social selection, regardless of gender, and support a needed shift in service profiles for unemployed young adults-from a narrow focus on job skills training to a more holistic approach that incorporates knowledge from addiction science in which unemployed young adults can find needed services to cope with job loss.

Childhood predictors of adult adiposity: findings from a longitudinal study.

AIMS: The increasing prevalence of overweight and obesity has become a key challenge for New Zealand. The purpose of the present study was to examine childhood risk factors for adult adiposity in a longitudinal birth cohort. METHODS: Data were gathered from the Christchurch Health and Development Study (CHDS), a birth cohort of 1,265 children born in Christchurch in 1977. Associations were examined between socio-demographic background, perinatal factors, infant and child characteristics, family functioning/child maltreatment and adiposity at ages 30 and 35 years. Adiposity was assessed using body mass index scores. RESULTS: At ages 30 and 35, approximately one-third of cohort members were overweight and one-fifth were obese. Generalised estimating equation models showed that statistically significant (p<.05) predictors of later adiposity and overweight/obesity were: male gender, being born into a single-parent family, having parents with larger body size, higher early infant growth, limited or no breastfeeding, lower levels of cognitive ability and exposure to severe sexual abuse. CONCLUSIONS: Overweight and obesity was associated with social and family background, biological endowment, cognitive ability and childhood adversity factors. These findings may assist in the development of structured adiposity intervention programmes in conjunction with established community organisations specialising in child and family health.

Childhood predictors of adult adiposity: findings from a longitudinal study.

AIMS: The increasing prevalence of overweight and obesity has become a key challenge for New Zealand. The purpose of the present study was to examine childhood risk factors for adult adiposity in a longitudinal birth cohort. METHODS: Data were gathered from the Christchurch Health and Development Study (CHDS), a birth cohort of 1,265 children born in Christchurch in 1977. Associations were examined between socio-demographic background, perinatal factors, infant and child characteristics, family functioning/child maltreatment and adiposity at ages 30 and 35 years. Adiposity was assessed using body mass index scores. RESULTS: At ages 30 and 35, approximately one-third of cohort members were overweight and one-fifth were obese. Generalised estimating equation models showed that statistically significant (p<.05) predictors of later adiposity and overweight/obesity were: male gender, being born into a single-parent family, having parents with larger body size, higher early infant growth, limited or no breastfeeding, lower levels of cognitive ability and exposure to severe sexual abuse. CONCLUSIONS: Overweight and obesity was associated with social and family background, biological endowment, cognitive ability and childhood adversity factors. These findings may assist in the development of structured adiposity intervention programmes in conjunction with established community organisations specialising in child and family health.