Variable | Odds ratio (95%CI) |
---|---|
Patient variables | |
 Maternal comorbidity index | 1.88 (1.86–1.99) |
Age (years) | |
 < 15 | 1.73 (0.76–3.91) |
 15–19 | 1.11 (1.00–1.25) |
 20–24 | Reference |
 25–29 | 1.04 (0.97–1.12) |
 30–34 | 1.19 (1.11–1.28) |
 35–39 | 1.49 (1.38–1.61) |
 40–44 | 2.22 (2.00–2.48) |
 > 44 | 2.91 (2.24–3.78) |
Parity | 0.78 (0.76–0.81) |
Residence (urban/rural) | 1.09 (1.02–1.16) |
Transfer between hospitals | 13.94 (12.1–13.83) |
Income quintile | |
 1 (lowest) | 1.44 (1.34–1.55) |
 2 | 1.28 (1.20–1.39) |
 3 | 1.20 (1.10–1.28) |
 4 | 1.12 (1.03–1.21) |
 5 (highest) | Reference |
Hospital variables | |
 Hospital (urban versus rural) | 1.30 (0.94–1.79) |
Groups according to hospital volume of pregnancy | |
 1 (lowest volume) | 12.94 (12.10–13.83) |
 2 | Reference |
 3 | 1.36 (1.00–1.86) |
 4 | 1.51 (1.10–2.07) |
 5 (highest volume) | 1.32 (0.96–1.80) |
Province | |
 Newfoundland and Labrador | 1.20 (0.76–1.89) |
 Prince Edward Island | 0.50 (0.18–1.39) |
 Nova Scotia | 0.70 (0.44–1.13) |
 New Brunswick | 0.64 (0.41–1.02) |
 Ontario | Reference |
 Manitoba | 0.32 (0.21–0.48) |
 Saskatchewan | 0.60 (0.41–0.87) |
 Alberta | 0.35 (0.27–0.46) |
 British Columbia | 0.48 (0.37–0.62) |
 Territories | 0.37 (0.11–1.23) |