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Table 3 Standardized mortality ratios for the four systems by reason of admission and source of admission

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

  All patients Patient s with LOS ≥ 24 h Standardized mortality ratio (95% confidence interval)
Subcategory N Died N Died MPM II0 MPM II24 APACHE II SAPS II
Reason for admission         
   Respiratory 156 46 132 39 1.21 (0.92–1.50) 1.07 (0.79–1.35) 0.93 (0.69–1.18) 1.29 (0.95–1.63)
   Cardiovascular 222 132 152 82 1.07 (0.96–1.19) 0.98 (0.84–1.12) 0.99 (0.84–1.13) 1.05 (0.90–1.21)
   Neurological 58 20 43 16 0.91 (0.59–1.23) 0.96 (0.59–1.33) 1.17 (0.72–1.62) 1.39 (0.85–1.93)
   Other medical 87 41 63 32 1.02 (0.79–1.25) 1.05 (0.80–1.31) 1.05 (0.79–1.31) 1.32(1.00–1.63)
   Non-op. trauma 146 24 126 18 0.73 (0.46–0.99) 0.60 (0.34–0.85) 1.09 (0.62–1.56) 0.73 (0.42–1.04)
   Op. trauma 52 11 37 6 0.83 (0.40–1.27) 0.75 (0.20–1.30) 1.21 (0.32–2.10) 0.75 (0.20–1.31)
   Post-op. 241 30 127 21 0.79 (0.53–1.05) 0.79 (0.48–1.10) 0.89 (0.54–1.24) 1.04 (0.64–1.45)
Source of admission         
   Emergency room 312 87 224 53 0.89 (0.73–1.05) 0.77 (0.59–0.95) 0.94 (0.72–1.16) 0.93 (0.71–1.14)
   Floor 292 149 228 107 1.11 (0.99–1.24) 1.02 (0.88–1.16) 1.02 (0.88–1.16) 1.18 (1.01–1.34)
   Operating room 307 52 179 38 0.89 (0.67–1.11) 0.85 (0.61–1.08) 1.01 (0.72–1.29) 1.06 (0.76–1.36)
   Other hospital 58 22 50 17 1.21 (0.81–1.61) 1.21 (0.75–1.68) 1.09 (0.67–1.51) 1.29 (0.79–1.79)
  1. LOS, length of stay.