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

na
 % 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

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.

Gupta et al. Critical Care 2004 9(Suppl 3):S14   doi:10.1186/cc3746