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Progress of spontaneous labor at term
| Parameter | Median | 5th percentile |
|---|---|---|
| Nullipara | ||
| Total duration | 10.1 h | 25.8 h |
| First stage | 9.7 h | 24.7 h |
| Second stage | 33 min | 117.5 min |
| Third stage | 5 min | 30 min |
| Latent phase | 6.4 h | 20.6 h |
| Maximum dilatation rate | 3 cm/h | 1.2 cm/h |
| Descent rate | 3.3 cm/h | 1 cm/h |
| Multipara | ||
| Total duration | 6.2 h | 19.5 h |
| First stage | 8 h | 18.8 h |
| Second stage | 8.5 min | 46.5 min |
| Third stage | 5 min | 30 min |
| Latent phase | 4.8 h | 13.6 h |
| Maximum dilatation rate | 5.7 cm/h | 1.5 cm/h |
| Descent rate | 6.6 cm/h | 2.1 cm/h |
