Table 5.
Logistic regression results a of maternal outcomes in non-rural hospitals
| Non-rural Hospital volume category | ||||
|---|---|---|---|---|
| 1 50–1,199 |
2 1,200–2,399 |
3 2,400–3,599 |
4 ≥3,600 |
|
| Chorioamnionitis | 1.13 (0.74, 1.74) | 1.13 (0.79, 1.60) | 1.36 (0.94, 1.95) | Ref. |
| Endometritis | 1.07 (0.73, 1.55) | 0.94 (0.70, 1.26) | 1.40 (1.00, 1.96) | Ref. |
| Postpartum hemorrhage | ||||
| Overall | 1.29 (0.92, 1.81) | 1.14 (0.86, 1.52) | 1.22 (0.86, 1.74) | Ref. |
| Spontaneous vaginal delivery | 1.32 (0.95, 1.83) | 1.15 (0.88, 1.52) | 1.15 (0.83, 1.57) | Ref. |
| Operative vaginal delivery | 1.16 (0.81, 1.67) | 0.94 (0.67, 1.32) | 1.09 (0.74, 1.61) | Ref. |
| Cesarean delivery | 1.22 (0.76, 1.97) | 1.15 (0.75, 1.76) | 1.62 (0.92, 2.83) | Ref. |
| Blood transfusion | 1.02 (0.76, 1.36) | 1.30 (1.03, 1.66) | 1.19 (0.94, 1.51) | Ref. |
| Severe perineal lacerations (spontaneous vaginal delivery) |
1.01 (0.83, 1.23) | 0.94 (0.82, 1.09) | 1.04 (0.87, 1.24) | Ref. |
| Wound infection (cesarean delivery) | 1.41 (0.87, 2.29) | 1.03 (0.75, 1.42) | 1.28 (0.88, 1.84) | Ref. |
| Prolonged length of stay b | 1.41 (0.94, 2.13) | 1.27 (0.97, 1.66) | 1.06 (0.79, 1.42) | Ref. |
| NTSV cesarean delivery | 1.02 (0.85, 1.22) | 0.93 (0.81, 1.06) | 0.88 (0.78, 1.00) | Ref. |
a
Results are presented as adjusted odds ratio (95% confidence interval). Models controlled for maternal race/ethnicity, education, age, prenatal care, insurance status, and teaching hospital. Where appropriate, models controlled for parity. Models estimated robust standard errors accounting for hospital-level clustering.
b
Prolonged length of stay: >3 days for vaginal deliveries; >5 days for cesarean deliveries
Abbreviations: NTSV, nulliparous, term, singleton, vertex