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Table 1 Patients' demographics

From: Assessment of performance of four mortality prediction systems in a Saudi Arabian intensive care unit

Variable Total Survivors Non-survivors P value*
Total number 969 (100) 659 (100) 310 (100) -
Number of females 363 (37.46) 246 (37.33) 117 (37.74) NS
Age in years (mean ± SD) 49.09 ± 20.19 45.78 ± 20.09 56.15 ± 18.53 <0.001
Lead time in days (mean ± SD) 4.08 ± 8.93 3.66 ± 8.04 4.98 ± 10.53 0.05
ICU LOS in days (mean ± SD) 6.58 ± 9.76 5.99 ± 8.80 7.82 ± 11.44 0.01
Hospital LOS in days (Mean ± SD) 31.75 ± 43.80 35.17 ± 43.27 24.45 ± 44.14 <0.001
APACHE II score (mean ± SD) 18.85 ± 9.13 15.75 ± 7.46 25.63 ± 8.80 < 0.001
SAPS II score (mean ± SD) 38.02 ± 19.90 31.20 ± 15.63 52.98 ± 20.11 < 0.001
Type of admission     
   Medical 662 (68.32) 404 (61.31) 258 (83.23) <0.001
   Elective surgical 173 (17.85) 155 (23.52) 18 (5.81) <0.001
   Emergency surgical 134 (13.83) 100 (15.17) 34 (10.97) NS
   Chronic illness:     
Hepatic 121 (12.5) 32 (4.86) 89 (28.71) <0.001
Cardiovascular 35 (3.62) 24 (3.64) 11 (3.55) NS
Renal 54(5.58) 32(4.86) 22 (7.10) NS
Respiratory 68 (7.02) 55 (8.35) 13 (4.19) 0.02
Immunosuppression 85 (8.78) 39 (5.92) 46 (14.84) <0.001
Any of the above 310 (32.02) 166 (25.19) 144 (46.45) <0.001
ICU mortality 204 (21.05) 0 204 (65.81)  
  1. Figures in parentheses are percentages. *Survivors versus non-survivors. LOS, length of stay; NS, not significant.