Table 3

Hosmer–Lemeshow goodness-of-fit test values: time point for which the scores were developed
Score
 Mortality probability classes (%)
 Expected deaths
 Observed deaths
 Observed survivors
 Expected survivors
 χ2 goodness-of-fit test values
 SMR (95% CI)
PIM 1 hour
 <1
 1.3
 3
 175
 176.7
 2.2

1 to <5
 8.3
 15
 357
 363.7
 5.5

5 to <15
 12.2
 23
 127
 137.9
 10.4

15 to <30
 13.0
 15
 47
 49.0
 0.4

≥30
 22.8
 24
 16
 17.2
 0.1
Totals
57.6
 80
 722
 744.7
 18.7
 1.39 (1.10–1.73)*
PRISM 24 hours
 <1
 1.5
 4
 237
 239.5
 4.2

1 to <5
 7.7
 16
 313
 321.3
 9.2

5 to <15
 10.2
 9
 112
 110.8
 0.2

15 to <30
 8.5
 7
 33
 31.5
 0.3

≥30
 49.5
 44
 27
 21.5
 2.0
Totals
77.4
 80
 722
 724.6
 15.9
 1.03 (0.82–1.29)
PRISM III 12 hours
 <1
 1.8
 4
 422
 424.2
 2.7

1 to <5
 4.4
 14
 175
 184.6
 21.4

5 to <15
 7.5
 10
 75
 77.5
 0.9

15 to <30
 7.2
 5
 27
 24.8
 0.9

≥30
 51.1
 47
 23
 18.9
 1.2
Totals
72.0
 80
 722
 730.0
 27.1
 1.11 (0.88–1.38)
PRISM III 24 hours
 <1
 1.7
 3
 474
 475.3
 1.0

1 to <5
 3.3
 12
 133
 141.7
 23.5

5 to <15
 7.0
 14
 72
 79.0
 7.7

15 to <30
 6.2
 5
 25
 23.8
 0.3

≥30
 48.6
 46
 18
 15.4
 0.6
Totals
66.8
 80
 722
 735.2
 33.0
 1.20 (0.95–1.49)

*Significantly greater than 1 (P = 0.002) [13]. CI, confidence interval; PIM, Paediatric Index of Mortality [4]; PRISM, Paediatric RISk of Mortality [1,2]; SMR, standardized mortality ratio.

Leteurtre et al. Critical Care 2004 8:R185   doi:10.1186/cc2869