Table 4.

Regression analyses of weight-for-length z-scores (WLZ) at birth and their evolution over time by exposure to antiretroviral drugs (ARV).

	Univariable linear regression of WLZ at birth N=501		Multivariable linear regression of WLZ at birth* N=300
	Difference in WLZ (95%CI)	P-value	Difference in WLZ (95%CI)	P-value
ARVs in the first trimester	−0.18 (−0.53 to 0.16)	0.29	−0.40 (−0.80 to 0.003)	0.05
No ARVs during pregnancy	0.04 (−0.36 to 0.29)	0.83	0.24 (−0.34 to 0.82)	0.42
ARVs in the second or third trimester	0 (reference)	-	0 (reference)	-

	Univariable mixed-effects regression of WLZ over time (N=577)		Multivariable mixed-effects regression of WLZ over time (N=340)
	Difference in WLZ (95%CI)	P-value	Difference in WLZ (95%CI)	P-value
ARVs in the first trimester	0.01 (−0.19 to 0.22)	0.91	0.03 (−0.20 to 0.26)	0.80
No ARVs during pregnancy	−0.01 (−0.20 to 0.17)	0.88	−0.12 (−0.42 to 0.18)	0.43
ARVs in the second or third trimester	0 (reference)	-	0 (reference)	-

**CI, confidence interval; ARV, antiretroviral therapy; WLZ, weight-to-length-for-age z-score

^*Adjusted for mother's age (younger than 25 years or older), CD4 cell count (square root transformed), viral load (undetectable or detectable), year of birth, and family income.N=356 children