Table 2.

Unadjusted and Adjusted Models for Outcomes Comparing Infants of Perinatally vs Nonperinatally Human Immunodeficiency Virus–Infected Women, Adjusting for Calendar Period of Delivery

LBW a		SGA a		Preterm Delivery a		BWZ b
RR (95% CI)	P value	RR (95% CI)	P value	RR (95% CI)	P value	Difference (95% CI)	P value
Unadjusted
1.22 (0.92,1.62)	.17	1.06 (0.76,1.49)	.72	0.94 (0.70,1.27)	.69	-0.11 (-0.22, -0.01)	.03
Adjusted
1.23 (0.89,1.70)	.19	0.98 (0.66,1.44)	.89	1.01 (0.72,1.44)	.93	-0.12 (-0.24, -0.003)	.04

^{Models adjusted for maternal age, race, earliest CD4 count in pregnancy, maternal substance use in pregnancy, maternal tobacco use during pregnancy, maternal pre-pregnancy body mass index, most potent antiretroviral regimen in pregnancy, calendar year period of delivery.}

Abbreviations: BWZ, birth weight z score; CI, confidence interval; LBW, low birth weight (<2500 g); RR, relative risk; SGA, small for gestational age.

^aLog binomial models using generalized estimating equations

^bLinear mixed effects models