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

From: Case mix, outcome and activity for obstetric admissions to adult, general critical care units: a secondary analysis of the ICNARC Case Mix Programme Database

Variable Deaths n (%)   Odds ratio (95% CI) P
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)   
  1. aEvidence of any of a prespecified list of severe conditions in the past medical history, as defined in Acute Physiology and Chronic Health Evaluation (APACHE) II. CI, confidence interval; GCS, Glasgow Coma Scale; PaO2/FiO2, arterial oxygen tension; fractional inspired oxygen; SBP, systolic blood pressure; WBC, white blood count. *P < 0.05.