Nicole Black

Childhood Obesity and Cognitive Achievement

Obese children tend to perform worse academically than normal-weight children. If poor cognitive achievement is truly a consequence of childhood obesity, this relationship has significant policy implications. Therefore, an important question is to what extent can this correlation be explained by other factors that jointly determine obesity and cognitive achievement in childhood? To answer this question, we exploit a rich longitudinal dataset of Australian children, which is linked to national assessments in math and literacy. Using a range of estimators, we find that obesity and body mass index are negatively related to cognitive achievement for boys but not girls. This effect cannot be explained by sociodemographic factors, past cognitive achievement or unobserved time-invariant characteristics and is robust to different measures of adiposity. Given the enormous importance of early human capital development for future well-being and prosperity, this negative effect for boys is concerning and warrants further investigation.

Response-scale heterogeneity in the EQ-5D

This paper discusses two types of response-scale heterogeneity, which may impact upon the EQ-5D. Response-scale heterogeneity in reporting occurs when individuals systematically differ in their use of response scales when responding to self-assessments. This type of heterogeneity is widely observed in relation to other self-assessed measures but is often overlooked with regard to the EQ-5D. Analogous to this, preference elicitation involving the EQ-5D could be subject to a similar type of heterogeneity, where variations across respondents may occur in the interpretations of the levels (response categories) being valued. This response-scale heterogeneity in preference elicitation may differ from variations in preferences for health states, which have been observed in the literature. This paper explores what these forms of response-scale heterogeneity may mean for the EQ-5D and the potential implications for researchers who rely on the instrument as a measure of health and quality of life. We identify situations where they are likely to be problematic and present potential avenues for overcoming these issues. Copyright

Getting Weighed Down: The Effect of Childhood Obesity on the Development of Socioemotional Skills

Childhood obesity not only has serious long-term health implications but also can hinder the development of socioemotional skills. We use data from the Longitudinal Survey of Australian Children to examine the effect of childhood obesity on socioemotional difficulties. Using various specifications to estimate the socioemotional-skills production function, we show that obesity increases emotional problems for both genders and increases peer problems and decreases conduct problems for boys. Obesity does not appear to affect hyperactivity or prosocial behavior. Our results are robust to alternative identifying assumptions, the inclusion of a range of time-varying shocks, and alternative measures of adiposity. Our findings suggest that childhood obesity adversely affects emotional and social skills, which are both important determinants of human capital development and future economic prosperity.

Justification bias in self-reported disability: new evidence from panel data

The relationship between health and work is frequently investigated using self-assessments of disability from social surveys. The complication is that respondents may overstate their level of disability to justify non-employment and welfare receipt. This study provides new evidence on the existence and magnitude of justification bias by exploiting a novel feature of a large longitudinal survey: each wave respondents are asked identical disability questions twice; near the beginning and end of the face-to-face interview. Prior to answering the second disability question, respondents are asked a series of questions that increase the salience of their employment and welfare circumstances. Justification bias is identified by comparing the variation between the two measures within-individuals over time, with the variation in employment status over time. Results indicate substantial and statistically significant justification bias; especially for men and women who receive disability pensions.

For richer, for poorer: the relationship between adolescent obesity and future household economic prosperity

Adolescent obesity not only has serious long-term health implications, but also the potential to lead to a socioeconomic trajectory of lower earnings and household income. However, the magnitude and mechanisms of such outcomes across the life course are poorly understood. Using birth cohort data from the British National Child Development Study (1958 to 2008), we examined the relationship between adolescent obesity (at age 16) and future household income, employment, wages, marriage and spousal earnings when individuals were in their 30s, 40s and 50s. We additionally investigated the role of obesity persistence from childhood (age 11) through to adulthood (age 33). After adjusting for a rich set of childhood characteristics, compared to normal weight, obesity at age 16 was associated with significantly lower levels of future household income for women (by approximately 14%), but not men. This household income penalty was greater for women with obesity in both childhood and adulthood. The household income penalty for women appeared to be driven by a lower likelihood of marriage and lower spousal earnings for those who were married, and not by their own wage penalty in the labour market. The spousal earnings penalty occurred even when obesity did not persist into adulthood.

The health care costs of childhood obesity in Australia: An instrumental variables approach

&NA; The effect of childhood obesity on medical costs incurred by the Australian Government is estimated using five waves of panel data from the Longitudinal Study of Australian Children, which is linked to public health insurance administrative records from Medicare Australia. Instrumental variables estimators are used to address concerns about measurement error and selection bias. The additional annual medical costs due to overweight and obesity among 6 to 13 year olds is about

Who provides inconsistent reports of their health status? The importance of age, cognitive ability and socioeconomic status

43 million (in 2015 AUD). This is driven by a higher utilisation of general practitioner and specialist doctors. The results suggest that the economic consequences of childhood obesity are much larger than previously estimated.