Disentangling Safety Culture's Role in Reducing Cesarean Overuse: Creating a Revised Labor Culture Survey.

Objective: To measure and assess the relationship of patient safety culture to reducing cesarean overuse.

Study Setting: Maternity care hospitals in Michigan.

Study Design: Cross-sectional observational design, combining individual survey data with hospital characteristics using existing databases. Multivariate Poisson regression assessed the associations between survey scores and hospital nulliparous term singleton vertex cesarean rates. Factor analysis determined the scalability of survey items.

Data Collection Methods: Electronic survey distributed at the hospital site level.

Principal Findings: A total of 3091 clinicians from 54 out of 57 eligible hospitals completed the survey. Confirmatory factor analysis demonstrated best fit with a univariate model with two local factors. The new scale encompassing both local factors, including vaginal birth microculture and safety culture, is entitled "Unit Norms." The safety culture subdomain demonstrated an association with a reduction in hospital cesarean rate [-0.15; 95% CI: -0.27 to -0.04; incident rate ratio (IRR) 0.86], parallel to but lower in magnitude to vaginal birth microculture (-0.18; 95% CI: -0.35 to -0.02; IRR 0.84).

Conclusions: Vaginal birth microculture remains the strongest predictor of cesarean delivery overuse; however, safety culture characteristics, including teamwork, psychological safety, and communication, correlate with lower cesarean delivery rates. Measuring these aspects of hospitals' culture may be important for other areas of quality improvement initiatives focused on quality and safety.