Studies of virologic response rates to NNRTI-based treatment among women previously exposed to single-dose NVP.

aSome studies report outcomes at additional time points that are not listed here.bWomen who received ZDV or ZDV/3TC typically received the regimen from ∼36 wk gestation.cNumbers of patients includes those from whom a virologic response was available in the report.dProportions estimated by Kaplan-Meier method for references [17] and [28]. All others are raw proportions.eWomen who received NVP for PMTCT in this study got SDNVP alone, ZDV + SDNVP, or ZDV/3TC + SDNVP. Response rates listed here are from Table 3 in reference [27]. p-Value calculated using Fisher's exact test.fAll women in Thailand who were exposed to SDNVP also received antenatal ZDV; in Zambia and Kenya antenatal ZDV was not used. p-Values calculated using Fisher's exact test for each exposure interval compared to SDNVP unexposed.SDNVP, single dose intrapartum nevirapine.