Childcare Attendance and Obesity Risk

Area of Science:

• Pediatric Health
• Child Development
• Public Health

Background:

• Observational studies suggest nonparental childcare increases childhood obesity risk.
• Potential confounding factors like unmeasured variables and selection bias complicate these findings.
• The causal relationship between childcare attendance and obesity risk remains unclear.

Purpose of the Study:

• To investigate the causal effect of nonparental childcare on children's Body Mass Index (BMI) z scores.
• To analyze nationally representative data from infancy through kindergarten entry.
• To address confounding in the childcare-obesity association.

Main Methods:

• Utilized ordinary least squares (OLS) regression to assess longitudinal associations.
• Employed quasi-experimental methods: individual fixed effect models and instrumental variable (IV) analysis.
• Controlled for child, family, and neighborhood characteristics in OLS models.

Main Results:

• OLS regression showed higher BMI z scores in children attending nonparental childcare (0.08 [SE 0.03], P = .01).
• Fixed effects models found no significant effect of childcare on BMI z scores (β = 0.02 [SE 0.02], P = .62).
• Instrumental variable analysis also revealed no significant association (β = 1.12 [SE 0.76], P = .14).

Conclusions:

• No consistent association was found between nonparental childcare and childhood obesity.
• Observed associations in prior research may be attributed to unobserved family circumstances influencing childcare selection.
• Quasi-experimental methods suggest childcare type does not causally impact obesity risk.