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Table 4 Univariate analyses of individual patient factors in relation to receipt of mechanical ventilation in the first 24 hours after admission to the Case Mix Programme unit

From: Characteristics and outcome for admissions to adult, general critical care units with acute severe asthma: a secondary analysis of the ICNARC Case Mix Programme Database

  n a % Mechanically ventilatedb % Not mechanically ventilatedb OR (95% CI)
Age (years)     
   0–19 237 40.5 59.5 1.28 (1.22–1.34) per 10 year increase
   20–29 365 43.3 56.7  
   30–39 367 47.1 52.9  
   40–49 354 62.1 37.9  
   50–59 340 65.6 34.4  
   60+ 489 72.2 27.8  
Steroid treatment in previous 6 months     
   No 1849 57.0 43.0 1.00
   Yes 303 56.1 43.9 0.97 (0.76–1.23)
CPR within 24 hours before admission     
   No 1966 54.1 45.9 1.00
   Yes 171 88.9 11.1 6.78 (4.18–11.02)
Neurological insult in first 24 hours     
   No 1,930 52.6 47.4 1.00
   Yes 222 93.7 6.3 13.39 (7.74–23.18)
Highest heart rate (beats/min)     
   <124 697 55.2 44.8 1.04 (1.00–1.08) per 10 beats/min increase
   124–141 739 58.1 41.9  
   ≥141 672 59.4 40.6  
Lowest PaO2 (kPa)     
   <9.8 615 66.0 34.0 0.83 (0.76–0.91) per 5 kPa increase
   9.8–12.4 652 66.6 33.4  
   ≥12.4 652 55.5 44.5  
pH from ABG with lowest PaO2     
   <7.32 591 84.8 15.2 0.99 (0.99–1.00) per pH 0.1 increase
   7.32–7.41 686 58.5 41.5  
   ≥7.41 640 46.7 53.3  
PaCO2 from ABG with lowest pH (kPa)     
   <5.7 607 34.8 65.2 6.61 (5.21–8.40) per 5 kPa increase
   5.7–8.2 597 65.0 35.0  
   ≥8.2 619 88.2 11.8  
Acute Physiology Score     
   0–8 682 41.4 58.6 1.18 (1.16–1.21) per 1 point increase
   9–12 620 60.3 39.7  
   13+ 602 80.6 19.4  
APACHE II score     
   0–10 621 39.8 60.2 1.15 (1.13–1.17) per 1 point increase
   11–15 626 58.8 41.2  
   16+ 657 80.1 19.9  
  1. aExcluding admissions missing the specified factor. bIn first 24 hours after admission to the Case Mix Programme (CMP) unit. ABG, arterial blood gas; APACHE, Acute Physiology and Chronic Health Evaluation; CI, confidence interval; CPR, cardiopulmonary resuscitation; OR, odds ratio; Paco2, arterial carbon dioxide tension; Pao2, arterial oxygen tension.