Table 1.
Characteristics of Deliveries at ≥37 Weeks of Gestation and with a Trial of Labor Overall and by Reported GBS Colonization Status
| Characteristic | Missing n (%) | GBS colonization |
No GBS colonization |
pa |
|---|---|---|---|---|
| n = 23,625 | n = 91,445 | |||
| Sociodemographic characteristics | ||||
| Maternal age, mean (SD), years | 54 (0.0) | 27.1 (6.01) | 27.2 (5.97) | 0.001 |
| Parity ≥1 | — | 13,287 (56.2) | 52,025 (56.8) | 0.07 |
| Race | ||||
| White | 3,733 (3.2) | 12,553 (54.8) | 48,491 (54.8) | <0.001 |
| Black | 5,695 (24.8) | 16,249 (18.3) | ||
| Latina | 3,441 (15.0) | 18,107 (20.4) | ||
| Asian | 805 (3.5) | 3,506 (3.9) | ||
| Other/multi-racial | 410 (1.7) | 2,080 (2.3) | ||
| Delivery year | ||||
| 2002–2003 | 14 (0.0) | 974 (4.1) | 4,190 (4.5) | <0.001 |
| 2004–2005 | 7,747 (32.7) | 30,773 (33.6) | ||
| 2006–2008 | 14,903 (63.0) | 56,469 (61.7) | ||
| Insurance status | ||||
| Private | 17,212 (14.9) | 12,930 (62.4) | 48,994 (63.5) | 0.003 |
| Public | 7,536 (36.3) | 27,115 (35.1) | ||
| Self-pay/other | 252 (1.2) | 1,031 (1.3) | ||
| Marital status, not married | 2,037 (1.7) | 8,876 (38.2) | 32,167 (35.8) | <0.001 |
| Tobacco use | — | 1,568 (6.6) | 5,694 (6.2) | 0.02 |
| Academic delivery hospital | — | 11,049 (46.7) | 41,778 (45.6) | 0.003 |
| Tertiary care hospital | — | 20,706 (87.6) | 79,039 (86.4) | <0.001 |
| U.S. region | ||||
| West | — | 9,881 (41.8) | 41,618 (45.5) | <0.001 |
| Midwest | 5,293 (22.4) | 14,852 (16.2) | ||
| South | 4,313 (18.2) | 21,040 (23.0) | ||
| Northeast | 4,138 (17.5) | 13,935 (15.2) | ||
| Clinical characteristics | ||||
| History of preterm birth | 4,098 (3.5) | 1,294 (5.6) | 4,612 (5.2) | 0.03 |
| Maternal comorbidities | ||||
| Chronic hypertension | — | 592 (2.5) | 2,196 (2.4) | 0.35 |
| Pre-eclampsia | — | 949 (4.0) | 3,492 (3.8) | 0.15 |
| Pregestational diabetes | — | 431 (1.8) | 1,368 (1.5) | <0.001 |
| Gestational diabetes | — | 1,003 (4.2) | 3,850 (4.2) | 0.81 |
| Mode of delivery, overall | ||||
| Cesarean | — | 3,461 (14.6) | 13,519 (14.7) | 0.60 |
| Vaginal | 20,164 (85.3) | 77,926 (85.2) | ||
| Spontaneous labor on L&D admission | — | 13,092 (55.4) | 51,185 (55.9) | 0.12 |
| Gestational age at delivery, mean (SD) | 39.0 (1.12) | 38.9 (1.12) | <0.001 | |
| 37–39 weeks | — | 15,414 (65.2) | 61,295 (67.0) | <0.001 |
| >39 weeks | 8,211 (34.7) | 30,150 (32.9) | ||
a
p-value comparing with versus without GBS colonization (chi-square for categorical variables and t-test for continuous variables).
GBS, group B streptococcus; SD, standard deviation.