The persistently higher odds of overweight and obesity among rural children even after adjustment suggest that rural environments may be "obesogenic" in ways that a person-level analysis cannot discern. Future research should examine disparities in the accessibility and affordability of healthy food and beverage choices and safe physical activity locales in rural areas.

Using data on the number of men and women who received doctorates in all academic field from 1971 to 2002, the authors examine changes in the sex composition of fields. During thi period, the proportion of women who received doctorates increased dramatically from 14 per cent to 46 percent. Regression models with fixed effects indicate no evidence that fields with declining relative salaries deter the entry of men, as would be predicted by the queuing the ory of Reskin and Roos. Consistent with the devaluation perspective and Schelling's tipping model, above a certain percentage of women, men are deterred from entering fields by th fields' further feminization. However, the rank order of fields in the percentage of women changed only slightly over time, implying that, to a large extent, men and women continued to choose fields as before, even when many more women received doctorates. The finding

The persistently higher odds of overweight and obesity among rural children even after adjustment suggest that rural environments may be "obesogenic" in ways that a person-level analysis cannot discern. Future research should examine disparities in the accessibility and affordability of healthy food and beverage choices and safe physical activity locales in rural areas.

The natural groupings of LTPA reflect adolescent's preference and these activity patterns are likely shaped by their social and physical environments. Better understanding of common LTPAs and their natural groupings is useful in the design of effective PA interventions.

Objective: To assess the effect of early life exposure to famine, as endured during 1959 to 1961 in China, on reproductive aging in adult women. Methods: Between 2011 and 2012, 2,868 women born around the Chinese famine period (1956-1964) were enrolled in this study from three communities in China. Age at natural menopause was obtained retrospectively from a structured questionnaire. The associations of early life famine exposure with reproductive aging during adulthood were estimated, with adjustment of socioeconomic status, lifestyle factors, and body mass index. Results: Women exposed to prenatal famine had a higher risk of early menopause (ie, natural menopause <45 years, odds ratio: 1.59, 95% confidence interval [CI]: 1.07, 2.36), and a nonsignificant trend of higher risk of premature ovarian failure (ie, natural menopause <40 y, odds ratio: 1.94, 95% CI: 0.93, 4.00), compared to unexposed women. Exposure to famine during childhood was not significantly associated with reproductive aging. In a secondary analysis focusing on the fetal exposure, prenatal famine exposure was associated with a higher risk of premature ovarian failure (odds ratio: 2.07, 95% CI: 1.08, 3.87), and a nonsignificant trend of higher risk of early menopause (odds ratio: 1.37, 95% CI: 0.98, 1.91), compared to those unexposed to prenatal famine. Conclusions: Our study showed that fetal exposure to famine was associated with an increased risk of early menopause. Such findings provided evidence in favor of the thrifty phenotype theory in reproductive aging and helped better understand the etiology of early menopause.