Residential substance use treatment outcomes for pregnant and postpartum women: Distinct patterns for women enrolled before versus during the COVID-19 pandemic.

Introduction: Substance use among pregnant and postpartum women (PPW) is a serious public health concern. The COVID-19 pandemic has exacerbated substance use among the general population including pregnant women, and disrupted operations for substance use treatment centers. Little is known about the outcomes of substance use treatment for PPW before and during the COVID-19 pandemic.