Table 5

Hosmer-Lemeshow goodness of fit test values: 4 hours
Score
 Mortality probability classes (%)
 Expected deaths
 Observed deaths
 Observed survivors
 Expected survivors
 χ2 goodness-of-fit test values
 SMR (95% CI)
PIM 4 hours
 <1
 0.9
 1
 140
 140.1
 0.0

1 to <5
 7.9
 13
 368
 373.1
 3.4

5 to <15
 13.1
 14
 144
 144.9
 0.1

15 to <30
 14.4
 18
 50
 53.6
 1.1

≥30
 32.2
 34
 20
 21.8
 0.2
Total
68.5
 80
 722
 733.5
 4.8
 1.17 (0.93–1.45)
PRISM 4 hours
 <1
 1.9
 8
 299
 305.1
 19.7

1 to <5
 7.7
 20
 321
 333.3
 20.1

5 to <15
 6.6
 12
 68
 73.4
 4.8

15 to <30
 6.5
 10
 21
 24.5
 2.4

≥30
 28.3
 30
 13
 14.7
 0.3
Totals
51.0
 80
 722
 751.0
 47.3
 1.57 (1.24–1.95)*
PRISM III 4 hours
 <1
 1.9
 6
 455
 459.1
 8.9

1 to <5
 4.3
 16
 167
 178.7
 32.6

5 to <15
 6.3
 12
 60
 65.7
 5.7

15 to <30
 7.0
 8
 25
 26.0
 0.2

≥30
 37.2
 38
 15
 15.8
 0.1
Totals
56.7
 80
 722
 745.3
 47.2
 1.41 (1.12–1.76)*

*Significantly greater than 1 (P < 0.0001 for PRISM at 4 hours and P = 0.0025 for PRISM III at 4 hours) [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