Abstract
BackgroundTwins with discordant growth have increased risks of perinatal mortality and morbidity. Previous studies have identified a number of risk factors for inter-twin birth weight discordance, yet no study has examined the effect of maternal hepatitis C infection.MethodsWe used the twin birth records extracted from the 2011 to 2015 United States birth records created by the Centers for Disease Control and Prevention. The outcome variable of this study was inter-twin birth weight discordance, defined as [(birth weight of larger twin–birth weight of smaller twin) / birth weight of larger twin]. The independent association of hepatitis C infection with birth weight discordance was examined using the gamma regression or log binomial regression, adjusted by potential confounders.ResultsOf the 270,256 twin pairs included in the final analysis, 850 (0.31%) had positive hepatitis C. Compared to mothers without hepatitis C, mothers with hepatitis C positive tended to have higher risk of birth weight discordance, but with no statistical significance. After adjustment for potential confounding factors, hepatitis C positive became a significant risk factor for birth weight discordance >25% (relative risk 1.14, 95% confidence interval 1.02−1.29). Sensitivity analyses (by treating birth weight discordance as a continuous outcome or dichotomizing into by different cutoffs) yielded similar results, with relative risks ranging from 1.07 to 1.12 (all P<0.05).ConclusionMaternal hepatitis C positive is associated with inter-twin birth weight discordance, an important adverse infant outcome in twin pregnancies, although the effect size is small.
Highlights
16% of twin pregnancies have birth weight discordance of at least 20% [1]
Of the 270,256 twin pairs included in the final analysis, 850 (0.31%) had positive hepatitis C
Maternal hepatitis C positive is associated with inter-twin birth weight discordance, an important adverse infant outcome in twin pregnancies, the effect size is small
Summary
16% of twin pregnancies have birth weight discordance of at least 20% [1]. Compared with twins with birth weight concordance, twins with discordant growth have increased risks of perinatal mortality and morbidity [1]. In the past two decades, a number of epidemiologic studies have been conducted to examine risk factors of inter-twin birth weight discordance, and have identified a number of risk factors including advanced maternal age, the use of assisted reproductive technology, hypertensive disorders in pregnancy, and smoking [2,3,4,5,6,7,8,9,10,11,12]. No study has examined the effect of HCV infection in pregnancy on inter-twin birth weight discordance. Previous studies have identified a number of risk factors for inter-twin birth weight discordance, yet no study has examined the effect of maternal hepatitis C infection
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