Table 5 Observed and predicted length of ICU stay and ICU length of stay ratio for post-operative patients

< 18.5

1.54 (0.85–3.02)

3.80 (2.97–4.73)

0.45 (0.25–0.86)

18.5–24.9

1.03 (0.81–2.08)

3.57 (2.67–4.50)

0.40 (0.24–0.73)

25.0–29.9

1.04 (0.82–2.17)

3.61 (2.68–4.50)

0.41 (0.24–0.77)

30.0–39.9

1.03 (0.81–2.07)

3.55 (2.58–4.49)

0.41 (0.25–0.76)

≥ 40.0

1.57 (0.84–2.54)

3.29 (1.68–4.30)

0.54 (0.30–0.96)