Table 3 Estimated odds ratios for multi-level logistic regression model for intensive care unit admission

 Maternal comorbidity index

1.88 (1.86–1.99)

 < 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)

 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 (urban versus rural)

1.30 (0.94–1.79)

 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)

 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)