Table 2.

Distribution of Bayley Scales for Infant Development–Chinese revision (BSID-CR) scores (points) among child participants at 2 years of age from a birth cohort study in Wuhan, China ($n=\mathrm{1,041}$ participants).

Development index	$\text{Mean}\pm \text{SD}$	25th	50th	75th	95th	Minimum–maximum
MDI	$110\pm 21.8$	98	114	126	138	50–150
PDI	$111\pm 17.1$	99	111	123	140	51–150

Note: 25th, 50th, 75th, 95th mean the 25th, 50th, 75th, and 95th percentile scores, respectively. MDI, mental development index; PDI, psychomotor development index; SD, standard deviation.