Fig. 1

Multivariable-adjusted rate ratios (RR) and 95% confidence intervals (CI) for the association of birth weight categories and genetic risk with inattention and hyperactivity scores among Japanese children at age 8–9 years. Note: Normal birth weight was defined as birth weight ≥ 2500 g and considered as the reference category. Models were adjusted for gender of child, parity, maternal age, education, pre-pregnancy body mass index, pre-pregnancy smoking status, alcohol intake, variations in survey time, father’s age at birth and household annual income