Table 1.
Maternal (N = 115,502) and Neonatal (N = 118,422)
Characteristics of the Study Population
| Maternal Characteristics | No. (%) |
|---|---|
| Age, y | |
| < 20 | 10187 (8.8) |
| 20–24.9 | 24299 (21.0) |
| 25–29.9 | 31101 (26.9) |
| 30–34.9 | 30570 (26.5) |
| ≥ 35 | 19345 (16.8) |
| Race/ethnicitya | |
| Non-Hispanic White | 52040 (45.1) |
| Non-Hispanic Black | 23878 (20.7) |
| Non-Hispanic Asian | 5999 (5.2) |
| Hispanic | 27291 (23.6) |
| Other | 5083 (4.4) |
| Not Documented | 1211 (1.1) |
| Body mass index at delivery, kg/m2b | |
| < 25 | 14242 (12.6) |
| 25–29.9 | 41268 (36.5) |
| 30–34.9 | 32088 (28.4) |
| 35–39.9 | 15088 (13.3) |
| ≥ 40 | 10481 (9.3) |
| Cigarette use during pregnancy | 11370 (9.9) |
| Cocaine or methamphetamine use during pregnancy | 830 (0.7) |
| Insurance status | |
| Uninsured/self-pay | 11989 (10.5) |
| Government-assisted | 45125 (39.4) |
| Private | 57462 (50.2) |
| Prenatal careb | 107510 (97.9) |
| Obstetric history | |
| Nulliparous | 46773 (40.5) |
| Prior vaginal delivery only | 49865 (43.2) |
| Prior cesarean only | 8872 (7.7) |
| Prior cesarean and vaginal | 9963 (8.6) |
| Any hypertension | 13272 (11.5) |
| Diabetes mellitus | |
| None | 106706 (92.4) |
| Gestational | 6999 (6.1) |
| Pre-gestational | 1734 (1.5) |
| Anticoagulant use during pregnancy | 920 (0.8) |
| Multiple gestation | 2815 (2.4) |
| Polyhydramnios | 940 (0.8) |
| Oligohydramnios | 4700 (4.1) |
| Placenta previa | 467 (0.4) |
| Placenta accreta | 162 (0.1) |
| Placental abruption | 930 (0.8) |
| PROM/PPROMb | 6004 (5.3) |
| GBS status | |
| Negative | 68918 (59.7) |
| Positive | 24390 (21.1) |
| Unknown | 22194 (19.2) |
| Neonatal Characteristics | |
| Presentation at delivery | |
| Vertex | 111174 (94.1) |
| Breech | 6010 (5.1) |
| Non breech malpresentation | 931 (0.8) |
| Gestational age at delivery, weeks | |
| 230through276 | 1256 (1.1) |
| 280 through336 | 4282 (3.6) |
| 340 through366 | 10024 (8.5) |
| 370 through376 | 10914 (9.2) |
| 380 through386 | 20723 (17.5) |
| 390 through396 | 37695 (31.8) |
| 400 through406 | 23876 (20.2) |
| 410 through416 | 8998 (7.6) |
| ≥ 420 | 654 (0.6) |
| Birthweight, g | |
| < 2500 | 12498 (10.6) |
| 2500–3999 | 96708 (81.7) |
| ≥ 4000 | 9186 (7.8) |
| Size for gestational age | |
| Small | 11530 (9.7) |
| Appropriate | 97774 (82.6) |
| Large | 9088 (7.7) |
Abbreviations: PROM/PPROM = premature rupture of the membranes or preterm premature rupture of the membranes; GBS = group B streptococcus.
a
Race/ethnicity was reported in the chart.
b
N = 113,167 with body mass index data; N = 109,773 with prenatal care visit data; N = 113,446 with PROM/PPROM data.