. Author manuscript; available in PMC: 2009 Mar 5.

Published in final edited form as: Pediatrics. 2009 Mar;123(3):1037–1044. doi: 10.1542/peds.2008-1162

TABLE 5.

Multivariate regression analysis of verbal and full scale IQ among preterm children

Variables in model	Verbal IQ	Full Scale IQ
	Mean difference (95% CI) N=355	Mean difference (95% CI) N=347
Birth weight (100 g increment)	0.1 (−1.0, 1.3)	0.5 (−0.5, 1.6)
Small for gestational age	−2.1 (−6.1, 2.0)	−0.4 (−4.3, 3.4)
Male gender (vs. female)	0.5 (−2.9, 3.9)	−0.7 (−4.0, 2.5)
Antenatal steroids	3.0 (−0.6, 6.6)	3.7 (0.3, 7.1)^*
BPD	−3.1 (−7.0, 0.9)	−2.4 (−6.1, 1.4)
Severe brain injury	−19.9 (−25.9, −13.9)^*	−22.1 (−28.1, −16.2)^*
Maternal age < 20 (vs. ≥ 20)	−0.5 (−5.7, 4.7)	−0.4 (−5.4, 4.6)
Maternal years of education (1 year increment)	2.3 (1.6, 3.1)^*	2.0 (1.3, 2.7)^*
Single-parent household (vs. two-parent household)	−5.3 (−9.1, −1.6)^*	−5.9 (−9.4, −2.3)^*
Minority status by maternal report (white non-hispanic vs. others)	−8.9 (−12.9, −4.8)^*	−8.4 (−12.2, −4.5)^*
Model adjusted R²	0.29	0.31

p-value < 0.05