Table 6 Odds ratio estimates from the best logistic regression model as selected by the Akaike Information Criterion (n = 1212)

Type of condition

   Haemorrhage

6

581 (1.0)

1.00

0.167

   Hypertensive

16

631 (2.5)

2.30 (0.71–7.49)

Surgical status

   Surgical (admission from theatre)

6

662 (0.9)

1.00

0.093

   Nonsurgical

16

550 (2.9)

2.53 (0.86–7.44)

Past medical history present*^a

   No

20

1200 (1.7)

1.00

0.010

   Yes

2

12 (16.7)

14.91 (1.88–118.13)

SBP (mmHg)*

   Below normal (<100)

129

338 (3.6)

1.38 (1.06–1.81) per 10 mmHg deviation from normal

0.017

   Normal range (100–170)

1

467 (0.2)

   Above normal (>170)

9

407 (2.2)

Heart rate (beats/min)*

   Below normal (<60)

1

86 (1.2)

1.36 (1.08–1.71) per 10 beats/min deviation from normal

0.009

   Normal range (60–100)

1

248 (0.4)

   Above normal (>100)

20

878 (2.3)

PaO₂/FiO₂ ratio (mmHg)

   <280

14

409 (3.4)

1.49 (0.98–2.27) per 100 mmHg decrease

0.063

   280–330

4

413 (1.0)

   >330

4

390 (1.0)

Potassium (mmol/l)

   Below normal (<3)

2

29 (6.9)

0.18 (0.01 – 2.46) per 1 mmol/l deviation from normal

0.198

   Normal range (3–5.5)

18

1069 (1.7)

   Above normal (>5.5)

2

114 (1.8)

Lowest WBC (× 10⁹/l)

   <10

8

409 (2.0)

1.67 (0.96–2.92) per 5 × 10⁹/l decrease

0.070

   10–13

7

357 (2.0)

   >13

7

446 (1.6)

GCS*

   3–10

10

86

(11.6)

1.27 (1.16–1.39) per 1 point decrease

<0.001

   11–14

2

94

(2.1)

   15

10

1032

(1.0)