The effect of a micronutrient powder home fortification program on anemia and cognitive outcomes among young children in rural China: a cluster randomized trial

Table 10 Dose–response effects of multiple micronutrient powder provision on Bayley mental and psychomotor development delay

	Mental delay (MDI < 80)¹		Psychomotor delay (PDI < 80)¹
	Marginal Effect (95% CI)	P value	Marginal Effect (95% CI)	P value
Effect of MNP distribution after 6 months (children 12–18 months of age)	− 0.000 (− 0.001–0.0002)	0.146	− 0.000 (− 0.000–0.000)	0.936
Effect of MNP distribution after 12 months	− 0.001 (− 0.001–0.000)	0.101	0.000 (− 0.00–0.00)	0.323
Effect of MNP distribution after 18 months	− 0.000 (− 0.001–0.000)	0.396	0.00 (− 0.001–0.001)	0.667
R-squared	0.23		0.12
Observations	6204		6186

¹ Intention to treat analysis, and regression estimates from multiple linear models adjusted for gender, age, parenting practice (whether caregiver used toys played with child the previous day, sang to child previous day), BSID tester and county fixed effects. Standard errors are clustered at the village level. MDI data missing for 214 observations (5 in baseline, 101, 88 and 20 in 6 months, 12 months and 18 months follow-up), and PDI data missing for 233 children (7 in baseline, 102, 98 and 26 in 6 months, 12 months and 18 months follow-up)

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