. Author manuscript; available in PMC: 2014 Mar 1.

Published in final edited form as: Paediatr Perinat Epidemiol. 2012 Dec 10;27(2):199–207. doi: 10.1111/ppe.12025

Table 4.

Correlations of Motor & Social Development scale with Bayley-III scores

	Bayley-III motor scale	Bayley-III cognitive scale
	Pearson correlation coefficient (p-value), number
All visits	0.49 (p<0.0001) N=279	0.45 (p<0.0001) N=207
First visit only	0.45 (p<0.0001) N=166	0.36 (p<0.0001) N=109
Age categories (all visits)
<9 months	0.36 (p=0.36) N=58	0.25 (p=0.25) N=20
9 to <12 months	0.54 (p=0.07) N=12	0.32 (==0.34) N=11
12 to <15 months	0.48 (p=0.0009) N=44	0.28 (P=0.14) N=29
15 to <18 months	0.59 (P=0.0006) N=30	0.33 (P=0.12) N=23
18 to <24 months	0.47 (P<0.0001) N=68	0.52 (P<0.0001) N=49
≥24 months	0.54 (P<0.0001) N=67	0.50 P<0.0001) N=67
Maternal education
Low	0.45 (p<0.0001) N=89	0.32 (p=0.008) N=67
High	0.54 (p<0.0001) N=190	0.54 (p<0.0001) N=140