Table 5.
Length of labor for women with a vaginal delivery by maternal age.
| Age ≤ 15.9 | Age 16–19.9 | Age 20–24.9 | P-value | |
|---|---|---|---|---|
| Spontaneous labor (n=21,656) | ||||
| Duration of first stage of labor (hrs), median (10%, 90%) | 6.81 (2.25, 16.25) | 7.42 (2.59, 15.66) | 7.21 (2.55, 14.97) | <.01a |
| Less than 5 hrs, n (%) | 180 (32.26) | 1,718 (27.80) | 3,313 (29.28) | 0.30b |
| 5 to 12 hrs, n (%) | 267 (47.85) | 3,146 (50.91) | 5,887 (52.02) | |
| More than 12 hrs, n (%) | 111 (19.89) | 1,316 (21.29) | 2,116 (18.70) | |
| Duration of second stage of labor (min), median (10%, 90%) | 41 (11, 150) | 45 (12, 140) | 55 (15, 154) | <.01a |
| Less than 60 min, n (%) | 370 (64.35) | 3,853 (60.55) | 6,167 (53.32) | <.01b |
| 60 to 119 min, n (%) | 113 (19.56) | 1,614 (25.37) | 3,307 (28.59) | |
| 120 to 179 min, n (%) | 57 (9.91) | 547 (8.60) | 1,337 (11.56) | |
| 180 or more, n (%) | 35 (6.09) | 349 (5.48) | 754 (6.52) | |
| Total length of labor (hrs), median (10%, 90%) | 8.02 (2.58, 17.43) | 8.40 (3.08, 16.95) | 8.30 (3.03, 16.38) | 0.05a |
|
| ||||
| Induction of labor (n=12,108) | ||||
| Duration of first stage of labor (hrs), median (10%, 90%) | 12.97 (6.48, 28.20) | 13.70 (6.35, 28.70) | 12.50 (6.03, 27.38) | <.01a |
| Less than 5 hrs, n (%) | 11 (4.42) | 152 (4.70) | 335 (5.27) | 0.31b |
| 5 to 12 hrs, n (%) | 103 (41.37) | 1,197 (37.05) | 2,669 (41.98) | |
| More than 12 hrs, n (%) | 135 (54.22) | 1,882 (58.25) | 3,354 (52.75) | |
| Duration of second stage of labor (min), median (10%, 90%) | 43.5 (13, 145) | 46 (13, 141) | 53 (14, 151) | <.01a |
| Less than 60 min, n (%) | 158 (62.70) | 1,979 (60.26) | 3,503 (54.56) | 0.83b |
| 60 to 119 min, n (%) | 55 (21.83) | 832 (25.33) | 1,851 (28.83) | |
| 120 to 179 min, n (%) | 22 (8.73) | 291 (8.86) | 671 (10.45) | |
| 180 or more, n (%) | 17 (6.75) | 182 (5.54) | 396 (6.17) | |
| Total length of labor (hrs), median (10%, 90%) | 14.37 (7.52, 29.15) | 14.80 (7.30, 29.28) | 13.98 (7.13, 28.4) | <.01a |
Duration of first stage of labor was defined as the time from admission to cervical dilation 10 cm.
Duration of second stage of labor was defined as the time from cervical dilation 10 cm to delivery.
Total length of labor was defined as the time from admission to delivery.
a
Kruskal-Wallis Test
b
Wald Chi-Square test from multinomial logistic regression model (P-value adjusted by maternal race/ethnicity, marital status, insurance type, substance abuse, BMI at admission, hospital type, gestational age at delivery, epidural, any diabetes, any hypertensive disease, and initial cervical exam).