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. 2017 Nov 13;17:370. doi: 10.1186/s12884-017-1553-8

Table 1.

Expected time intervals from cm to cm presented in hours and minutes (50 percentile and 95 percentile) according to Zhang et al. [24]

Dilation of the cervix 50 percentilea 95 percentilea (dystocia)
From 4 to 5 cm 1 h / 15 min 6 h / 30 min
From 5 to 6 cm 45 min 3 h / 15 min
From 6 to 7 cm 30 min 2 h / 15 min
From 7 to 8 cm 30 min 1 h / 30 min
From 8 to 9 cm 30 min 1 h / 30 min
From 9 to 10 cm 30 min 1 h / 45 min
2. stage without EDAa
Expulsion phase max 60 min.
30 min 2 h / 45 min
2. stage with EDA
Expulsion phase max 60 min.
1 h 3 h / 30 min
Total time without EDA 4 h / 30 min 19 h / 30 min
Total time with EDA 5 h 20 h / 15 min

aEDA (epidural analgesia)