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Dose-response curve of oxytocin infusion following a bolus of 1 IU oxytocin. The ED50 and ED90 values for the oxytocin infusion dose needed to avoid uterine atony was around 11.0 IU/h (95% CI: −4.6−4.2) IU/h and 19.1 IU/h (95% CI:16.5–25.5) IU/h, respectively, which was derived from probit analysis.
