TABLE 2.
Outcomes and distribution of latent phase labor, nulliparous women (hours [n])
| Outcome | No/Yes | Point of distribution | P valuesa | ||||
|---|---|---|---|---|---|---|---|
| Mean | Median | 80th | 90th | 95th | |||
| Amniotomy | N | 10.9 (194) | 8.3 (256) | 16.0 (103) | 22.0 (58) | 28.2 (26) | <.001 |
| Y | 17.5 (29) | 13.5 (39) | 24.3 (16) | 30.0 (9) | 41.0 (4) | ||
| Oxytocin augmentation | N | 9.4 (187) | 7.5 (227) | 14.2 (89) | 18.5 (46) | 23.3 (23) | <.001 |
| Y | 18.9 (56) | 15.0 (75) | 26.0 (30) | 35.5 (15) | 53.8 (8) | ||
| Labor dystocia diagnosis | N | 9.0 (155) | 7.2 (196) | 14.0 (83) | 18.0 (40) | 22.2 (20) | <.001 |
| Y | 17.2 (74) | 13.2 (99) | 24.6 (40) | 30.7 (20) | 51.3 (10) | ||
| Epidural | N | 9.0 (139) | 7.2 (175) | 14.0 (72) | 17.9 (35) | 22.0 (21) | <.001 |
| Y | 15.8 (82) | 12.1 (116) | 23.8 (47) | 30.0 (26) | 42.1 (12) | ||
| Cesarean delivery | N | 11.6 (205) | 9.0 (279) | 16.8 (111) | 23.2 (56) | 29.0 (29) | .081 |
| Y | 14.8 (14) | 11.8 (18) | 24.0 (8) | 29.5 (4) | 32.5 (2) | ||
| Postpartum hemorrhage | N | 11.5 (183) | 9.0 (251) | 17.0 (100) | 23.6 (50) | 30.0 (26) | .259 |
| Y | 12.9 (34) | 10.0 (48) | 22.0 (19) | 25.3 (10) | 29.3 (5) | ||
| NICU admission | N | 11.8 (208) | 9.1 (273) | 17.0 (116) | 24.0 (56) | 30.0 (29) | .248 |
| Y | 9.9 (19) | 8.5 (22) | 14.0 (10) | 22.8 (5) | 26.9 (3) | ||
| Apgar < 7 at 5 min | N | 11.8 (219) | 9.2 (291) | 17.0 (123) | 24.0 (61) | 30.0 (30) | .904 |
| Y | 11.3 (1) | 5.3 (4) | 8.5 (2) | 22.1 (1) | 37.4 (1) | ||
a
P value from t test comparing subjects with latent phase labor < mean to subjects with latent phase labor ≥ mean.