Association of Hospital NTSV Cesarean Birth Rate and Hospital Type (Presence of Both FM & OB, FM-Only, and OB-Only) Delivery Volume <1,000
| Hospitals With | Estimate (95% CI) | P Value | Estimate (95% CI)a | 1 – aIRRb | P Value |
|---|---|---|---|---|---|
| Both FM & OB | reference | reference | |||
| FM-only | −0.30 (−0.49 to −0.12) | .0012 | −0.42 (−0.64 to −0.20) | 34.3% | .0002 |
| OB-only | −0.13 (−0.28 to 0.02) | .0888 | −0.13 (−0.30 to 0.03) | 13.0% | .111 |
aIRR = adjusted incident rate ratio; BMI = body mass index; FM = family medicine; NTSV = nulliparous, term, singleton, vertex; OB = obstetrician.
↵a Model adjusted for geographic location, maternal % BMI >30, maternal % age >35 years, and maternal % Medicaid as primary insurance.
↵b The adjusted incident rate ratio was subtracted from 1 to obtain the expected relative reduction in NTSV cesarean births for hospitals with FM only or OB only compared with both FM & OB.