Fig. 1: Flow-chart of pregnant persons with SARS-CoV-2 infection included in the study.
From: Preterm birth among pregnant persons with severe acute respiratory syndrome Coronavirus 2 infection
SARS-CoV-2 severe acute respiratory syndrome coronavirus 2, NAAT nucleic acid amplification testing 1To avoid overestimating preterm birth from reporting bias, we limited to pregnancies with at least 47 weeks (43 weeks gestation plus 4 weeks of reporting lag) between calculated LMP and the end of the reporting period (September 3, 2021). 2We weighted records abstracted based on the random sample to account for selection probability and nonresponse such that the sampling weights totaled the number of pregnancies meeting the case definition.
