HIV Infection and Its Impact on Fetal Outcomes Among Women of Advanced Maternal Age: A Propensity Score Weighted Matching Approach

Advanced maternal age (AMA) and HIV status have been investigated separately for their influence on infant outcomes. Both are associated with adverse fetal growth outcomes, including low birth weight (LBW) and preterm birth (PTB). However, the impact of the cooccurrence of these factors in relation to birth outcomes remains relatively understudied. We analyzed Florida hospital discharge data linked to vital records. The study population consisted of women who had a singleton live birth between 1998 and 2007 (N=1,687,176). The exposure variables were HIV infection and maternal age, while the outcomes of interest were LBW, PTB, and small for gestational age (SGA). We matched HIV-positive women to HIV-negative women on selected variables using propensity scores. To approximate relative risks, we computed adjusted odds ratios (AOR) and 95% confidence intervals (CI) generated from logistic regression models and accounted for the matched design using the generalized estimating equations framework. After adjusting for demographic variables, clinical conditions, and route of birth, the risks of LBW, PTB, and SGA remained significant for HIV-positive women, regardless of age. HIV-positive women of AMA (>= 35 years) were more likely to have infants of LBW (AOR=1.73, 95% CI = 1.37-2.18), PTB (AOR=1.35, 95% CI: 1.06-1.71), and SGA (AOR = 1.52, 95% CI = 1.22-1.89), compared to uninfected mothers of younger age (<35 years). For women of advanced age, HIV positivity elevates their risk for LBW and PTB. The interplay of HIV status and age should be considered by healthcare providers when determining appropriate interconception strategies for women and their families.