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The problem
Intervention: Responsive parenting training delivered over 6 home visits combined with daily supplementation with a maize-soy product fortified with 21 micronutrients for 6 months
Who it was tested with: 387 preschoolers aged 36-52 months at nutritional risk (height-for-age z-score < -1) in southwestern Guatemala; 51% male, 17% indigenous.
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.
"Linear mixed models were used to estimate changes in hemoglobin and ferritin from baseline (2015) to endline (2017) in a subsample with blood specimens (n = 218). Preschooler ferritin significantly increased over time in most arms... rates of change did not differ between study arms (p = 0.16). Preschooler hemoglobin did not change over time." The randomized controlled design with baseline and endline measurements and comparison between intervention and control arms provides experimental-level evidence that the combined parenting and micronutrient intervention produced no differential benefit in iron status compared to control conditions.
Subsample for blood analysis (n=218) is smaller than total enrolled (n=387); no information provided on intervention compliance or fidelity; mechanisms for lack of differential effects not explored.
Across countries and designs
1 study · 1 country
