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The problem
Intervention: Participation in federal nutrition assistance programs (WIC, SNAP, Medicaid) combined with improved infant diet quality through nutrition support services and caregiver education
Who it was tested with: US children from low-income households followed from birth to age 5 (n=3,051 unweighted; n=413,211 weighted).
Children or communities are compared with a group that did not receive the intervention, or followed over years. This is the design that best separates what the intervention did from everything else that changed.
"Data analyzed were from the WIC Infant and Toddler Feeding Practices Study-2, a national cohort of children followed from around birth up to 9 y... Associations between the durations of program participation were estimated with each outcome in survey-weighted multivariable regression analyses; mediation through IDQI was assessed using causal mediation." This is a longitudinal observational study using causal inference methods to estimate associations between nutrition program participation and outcomes, representing the strongest quasi-experimental evidence possible without randomization.
Observational study cannot prove causation; families may differ in unmeasured ways; mediation effects are modest, suggesting other factors beyond infant diet quality drive the associations; cross-sectional nature of some analyses limits inference.
Across countries and designs
1 study · 1 country
