Rates of obstetrical intervention are high
in U.S. hospitals, and we found large absolute differences in the risks of these interventions between planned out - of - hospital births and in - hospital births.38 In contrast, serious adverse fetal and neonatal outcomes are infrequent in all the birth settings we assessed, and the absolute differences in risk that we observed between planned birth locations were correspondingly small; for example, planned out - of - hospital births were associated with an excess of less than 1 fetal death per 1000 deliveries in multivariate and propensity - score - adjusted analyse
in U.S. hospitals, and we found large
absolute differences in the risks of these interventions between planned out - of - hospital births and in - hospital births.38 In contrast, serious adverse fetal and neonatal outcomes are infrequent in all the birth settings we assessed, and the absolute differences in risk that we observed between planned birth locations were correspondingly small; for example, planned out - of - hospital births were associated with an excess of less than 1 fetal death per 1000 deliveries in multivariate and propensity - score - adjusted analyse
in the risks of these interventions between planned out - of - hospital births and
in - hospital births.38 In contrast, serious adverse fetal and neonatal outcomes are infrequent in all the birth settings we assessed, and the absolute differences in risk that we observed between planned birth locations were correspondingly small; for example, planned out - of - hospital births were associated with an excess of less than 1 fetal death per 1000 deliveries in multivariate and propensity - score - adjusted analyse
in - hospital births.38
In contrast, serious adverse fetal and neonatal outcomes are infrequent in all the birth settings we assessed, and the absolute differences in risk that we observed between planned birth locations were correspondingly small; for example, planned out - of - hospital births were associated with an excess of less than 1 fetal death per 1000 deliveries in multivariate and propensity - score - adjusted analyse
In contrast, serious adverse fetal and neonatal outcomes are infrequent
in all the birth settings we assessed, and the absolute differences in risk that we observed between planned birth locations were correspondingly small; for example, planned out - of - hospital births were associated with an excess of less than 1 fetal death per 1000 deliveries in multivariate and propensity - score - adjusted analyse
in all the birth settings we assessed, and the
absolute differences in risk that we observed between planned birth locations were correspondingly small; for example, planned out - of - hospital births were associated with an excess of less than 1 fetal death per 1000 deliveries in multivariate and propensity - score - adjusted analyse
in risk that we observed between planned birth locations were correspondingly small; for example, planned out - of - hospital births were associated with an excess of less than 1 fetal death per 1000 deliveries
in multivariate and propensity - score - adjusted analyse
in multivariate and propensity -
score - adjusted analyses.
To assess the robustness of the results of our regression analysis, we performed covariate adjustment with derived propensity
scores to calculate the
absolute risk
difference (details are provided
in the Supplementary Appendix, available with the full text of this article at NEJM.org).14, 15 To calculate the adjusted
absolute risk
difference, we used predictive margins and G - computation (i.e., regression - model — based outcome prediction
in both exposure settings: planned
in - hospital and planned out - of - hospital birth).16, 17 Finally, we conducted post hoc analyses to assess associations between planned out - of - hospital birth and outcomes (cesarean delivery and a composite of perinatal morbidity and mortality), which were stratified according to parity, maternal age, maternal education, and risk level.