Table 3 |
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|
Measures of discrimination, calibration and model fit for SHARF T0, Mehta and UK APACHE II |
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|
SHARF T0 |
SHARF II0 |
Mehta |
UK APACHE II |
|
|
|
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|
Discrimination (AUC [95% CI]) |
0.632 (0.624–0.640) |
0.668 (0.660–0.676) |
0.693 (0.686–0.701) |
0.74 (0.733–0.748) |
|
|
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|
Calibration (mortality ratio [95% CI]) |
0.759 (0.747–0.771) |
0.950 (0.936–0.965) |
1.223 (1.205–1.242) |
1.147 (1.129–1.165) |
|
Hosmer-Lemeshow (C-statistic [P value]) |
20,894 (< 0.001) |
2,575 (< 0.001) |
2,170 (< 0.001) |
575 (< 0.001) |
|
Cox's regression calibration: |
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|
Slope (95% CI) |
0.247 (0.229–0.266) |
0.415 (0.390–0.439) |
0.444 (0.417–0.470) |
0.753 (0.720–0.787) |
|
Intercept (95% CI) |
-0.195 (-0.243 to -0.153) |
0.005 (-0.031 to -0.040) |
0.314 (0.278–0.350) |
0.306 (0.269–0.343) |
|
χ2 (1) (P value)a |
11,598 (< 0.001) |
2,303 (< 0.001) |
2,602 (< 0.001) |
596 (< 0.001) |
|
|
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|
Fit (Shapiro's Q [R statistic]) |
0.392 |
0.491 |
0.487 |
0.539 |
|
|
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|
aChi-squared statistic on one degree of freedom (and associated P value) from a likelihood ratio test of slope = 1, intercept = 0 in Cox's regression calibration model. APACHE, Acute Physiology and Chronic Health Evaluation; AUC, area under the receiver operating characteristic curve; CI, confidence interval; SHARF, Stuivenberg Hospital Acute Renal Failure. |
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|
Kolhe et al. Critical Care 2008 12(Suppl 1):S2 doi:10.1186/cc7003 |
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