Table 1.
Sample Description of Maternal and Fetal Characteristics in National Multisite DataSet from 2002 to 2008 (N = 24,729)
| Labor Phenotype Class |
||||||
|---|---|---|---|---|---|---|
| Maternal and Fetal Characteristics | Total samplea (N = 24,729) |
Class 1 Spontaneous: Early Admission (n = 11,168) |
Class 2 Spontaneous: Active Admission (n = 3077) |
Class 3 Induction: Moderate Duration Admission (n = 7485) |
Class 4 Spontaneous: Prolonged Second Stage (n = 1796) |
Class 5 Induction: Prolonged Complicated Admission (n = 1203) |
| Maternal age, n (%), y | ||||||
| <20 | 2248 (9.1) | 1197 (10.7) | 205 (6.6) | 496 (6.6) | 203 (11.3) | 147 (12.3) |
| 20-34 | 19,901 (80.5) | 8909 (79.8) | 2489 (80.9) | 611 (81.7) | 1445 (80.5) | 947 (78.9) |
| 35-39 | 2168 (8.8) | 889 (7.9) | 319 (10.4) | 745 (9.9) | 131 (7.3) | 84 (7.0) |
| ≥40 | 400 (1.6) | 170 (1.5) | 64 (2.1) | 129 (1.7) | 16 (0.9) | 21 (1.8) |
| Gestational age, n (%), wk | ||||||
| 37.0-38.9 | 8283 (33.5) | 4282 (38.3) | 1018 (33.1) | 2115 (28.3) | 464 (25.8) | 404 (33.6) |
| 39.0-40.0 | 11,868 (47.9) | 5073 (45.4) | 1650 (53.6) | 3918 (52.3) | 820 (45.7) | 407 (33.8) |
| 40.1-41.0 | 3994 (16.2) | 1662 (14.8) | 368 (11.9) | 1195 (15.9) | 458 (25.5) | 311 (25.9) |
| >41.0 | 584 (2.36) | 151 (1.4) | 41 (1.3) | 257 (3.4) | 54 (3.0) | 81 (6.7) |
| Parity, n (%) | ||||||
| Nulliparous | 10,453 (42.3) | 4807 (43.0) | 463 (24.8) | 2329 (31.1) | 1636 (91.1) | 918 (76.3) |
| Para 1-3 | 12,793 (51.7) | 5695 (50.9) | 1981 (64.4) | 4700 (62.8) | 155 (8.6) | 262 (21.8) |
| Para ≥4 | 1483 (6.0) | 666 (5.9) | 333 (10.8) | 456 (6.1) | 5 (0.3) | 23 (1.9) |
| Insurance, n (%) | ||||||
| Private | 17,413 (71.1) | |||||
| Public | 7081 (28.9) | 3385 (30.6) | 824 (27.2) | 2077 (28.0) | 297 (22.2) | 298 (33.4) |
| Prepregnancy BMI, n (%), kg/m2 | ||||||
| Underweight (BMI <18.5) | 1519 (6.1) | 2311 (6.8) | 227 (7.4) | 382 (5.1) | 116 (6.5) | 40 (3.3) |
| Normal (BMI 18.5 to <25.0) | 14,241 (57.6) | 6609 (59.2) | 1858 (60.4) | 4074 (54.4) | 1126 (62.7) | 574 (47.7) |
| Overweight (BMI 25.0 to <30) | 5357 (21.7) | 2311 (20.7) | 636 (20.4) | 1743 (23.3) | 357 (19.9) | 310 (25.8) |
| Obese (BMI ≥30) | 3612 (14.6) | 1494 (13.4) | 356 (11.6) | 1286 (17.2) | 197 (10.9) | 279 (23.2) |
| Institute of Medicine weight gain guidelines by BMI, n (%) | ||||||
| Met guidelines | 7918 (32.0) | 3626 (32.5) | 1062 (34.5) | 2385 (31.9) | 547 (30.5) | 298 (24.8) |
| Over guidelines | 11,379 (46.0) | 4992 (44.7) | 1179 (38.3) | 3513 (46.9) | 977 (54.4) | 728 (59.7) |
| Under guidelines | 5432 (21.9) | 2550 (22.8) | 836 (27.2) | 1587 (21.2) | 272 (15.1) | 187 (15.5) |
| Race and ethnicity, n (%) | ||||||
| White and non-Hispanic | 15,942 (64.5) | 6991 (65.4) | 1828 (61.6) | 5105 (70.4) | 1269 (75.8) | 749 (65.9) |
| Black and non-Hispanic | 3094 (12.5) | 1377 (12.9) | 422 (14.2) | 1034 (14.3) | 88 (5.3) | 173 (15.2) |
| Hispanic | 3677 (14.9) | 1862 (17.4) | 532 (17.9) | 882 (12.2) | 230 (13.7) | 171 (15.1) |
| Asian or Pacific Islander | 1015 (4.1) | 468 (4.4) | 184 (6.2) | 233 (3.2) | 88 (5.3) | 42 (3.7) |
| Smoking, n (%) | 1490 (6.0) | 758 (6.8) | 196 (6.4) | 370 (4.9) | 68 (3.8) | 98 (8.2) |
| Depression (prenatal), n (%) | 1404 (5.7) | 692 (6.2) | 130 (4.2) | 433 (5.8) | 82 (4.6) | 67 (5.6) |
| Hypertension, n (%) | 1553 (6.8) | 431 (4.2) | 89 (3.1) | 654 (9.2) | 133 (7.8) | 246 (23.3) |
| Newborn macrosomia (≥4000 g), n (%) | 1613 (6.6) | 619 (5.6) | 179 (5.9) | 527 (7.1) | 176 (9.9) | 112 (9.4) |
| Female fetal sex, n (%) | 12,412 (50.2) | 5649 (50.6) | 1511 (49.1) | 3832 (51.2) | 852 (47.5) | 568 (47.3) |
| Uterine scar, n (%) | 803 (3.3) | 463 (5.2) | 138 (4.5) | 127 (1.7) | 50 (2.8) | 25 (2.1) |
| Indication labor induction, n (%) | 9236 (100) | |||||
| Indicated | 4916 (53.2) | 300 (91.2) | 41 (95.4) | 3499 (46.8) | 347 (75.6) | 729 (79.2) |
| Elective | 4320 (46.8) | 29 (8.8) | 2 (4.7) | 3986 (53.3) | 112 (24.4) | 191 (20.8) |
Abbreviation: BMI, body mass index.
a
Missing data: Maternal age (n = 12), insurance (n = 235), race and ethnicity (n = 1001), hypertension diagnosis (1707), macrosomia (n = 255), fetal sex (n = 22).