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Table 5 Adjusted odds ratio of prematurity < 37 weeks by level of service, by jurisdiction (excluding stillbirths)

From: The safety of Canadian rural maternity services: a multi-jurisdictional cohort analysis

  Alberta British Columbia Nova Scotia
Service Level Adjusted ORa (95 % CI) (n = 66215) N Adjusted ORa (95 % CI) (n = 61,991) N Adjusted ORa (95 % CI) (n = 18,769) N
1 1.22 (0.78, 1.91) 308 1.31 (1.00, 1.72) 601  
2 1.32 (1.06, 1.63) 1286 1.04 (0.78, 1.40) 623 0.86 (0.40, 1.87) 99
3 1.17 (1.00, 1.36) 2912 1.18 (1.00, 1.39) 1892 1.14 (0.92, 1.40) 1772
4 1.07 (0.96, 1.20) 6691 0.80 (0.68, 0.93) 2976  
5 1.08 (1.01, 1.17) 21194 0.87 (0.78, 0.96) 6814 0.95 (0.74, 1.23) 993
6 1.23 (1.08, 1.40) 3852 0.95 (0.86, 1.05) 7206  
7 1.26 (0.79, 2.03) 262 0.82 (0.70, 0.96) 2778 1.32 (0.86, 2.03) 440
8 1.0 29710 1.0 39101 1.0 15465
  1. 1Adjusted for maternal age (<18, >35), parity, previous C-section, prior neonatal death, prior still birth, diabetes (existing & gestational), hypertension (existing & gestational)