Table 2.

Predictors of selected outcomes (ASQ-II total score) at 4 and 12 months of age: results of final step of backward selection multivariate linear regression analysis

Model	ASQ-II total score 4 months			ASQ-II total score 12 months
	n	F (P)	R2	n	F (P)	R2
	418	32.8 (< 0.001)	0.132	397	12.3 (< 0.001)	0.060
	β	95% CI	P	β	95% CI	P
Intercept	− 223.8	(− 341.6; −106.1)	< 0.001	− 278.9	− 484.7; − 73.1	0.008
Gestational age	8.1	(5.5; 10.7)	< 0.001	4.5	1.0; 8.0	0.01
Age at test (days)	1.3	(0.8; 1.8)	< 0.001	0.9	0.5; 1.3	< 0.001

Variables entered in model-For ASQ 4 months: maternal age, gestational age, length at birth, weight at birth, and age of infant at ASQ testing at 4 months; For ASQ 12 months: gestational age, Apgar score at 5 min, and age of infant at ASQ testing at 12 months