(231) Comparison of labor curves between spontaneous and inducing labor

There were 46,835 nulliparous and 77,503 multiparous patients included in the analysis. Labor curves are presented in Figure 1 and 2. In nulliparous patients, induction of labor compared to spontaneous labor had a significantly longer traverse time from 1 cm to 6 cm (median 9.5 hours [5th-95th percentile 1.7-25.2] vs. 7.1 hours [5th-95th percentile 1.3-18.9]; P < 0.01) but a shorter traverse time from 6 cm to 10 cm (median 1.6 hours [5th-95th percentile 0.2-5.8] vs. 1.9 hours [5th-95th percentile 0.2-6.7]; P < 0.01). In multiparous patients, induction of labor compared to spontaneous labor had a significantly longer traverse time from 1 cm to 6 cm (median 7.8 hours [5th-95th percentile 0.9-25.6] vs. 4.9 hours [5th-95th percentile 0.6-16.3]; P < 0.01) but a shorter traverse time from 6 cm to 10 cm (median 0.7 hours [5th-95th percentile 0.0-3.7] vs. 1.0 hours [5th-95th percentile 0.1-5.2]; P < 0.01).

Conclusion:

In nulliparous and multiparous patients, the duration of latent labor was longer in patients undergoing induction of labor compared to those who had spontaneous labor. The duration of active labor was shorter in patients undergoing induction of labor though the difference appeared to be clinically insignificant.