Fig. 3

Prevalence of neurodevelopmental delays with socioeconomic status and covariates. Prevalence of neurodevelopmental delays (event/1000 children) according to socioeconomic status groups using covariate variables: (A) sex, (B) birthweight, (C) head circumference at 4–6 months, (D) birth residence, (E) birth year, and (F) breastfeeding status at 4–6 months. SES, socioeconomic status