Research Article
Comparisons of Costs between Black Caribbean and White British Patients with Advanced Multiple Sclerosis in the UK
Table 4
Bootstrap regression with additional potential predictor variables.
| Variable | Reps. | Observed | Bias | Std. err. | (95% conf. interval) |
| Time with disease yrs | 1000 | −542.0193 | −7.667818 | 344.3306 | −1217.714 | 133.675 | (N) | −1236.73 | 124.6862 | (P) | −1243.697 | 117.6147 | (BC) |
| EDSS scores | 1000 | 5985.081 | 51.63416 | 2951.37 | 193.4844 | 11776.68 | (N) | 396.7714 | 11991.88 | (P) | 299.2502 | 11978.44 | (BC) |
| IMD scores | 1000 | .5103984 | .0567446 | .8758165 | −1.208252 | 2.229049 | (N) | −1.052415 | 2.274935 | (P) | −1.136945 | 2.226263 | (BC) |
| Gender | 1000 | 148.7712 | −335.9037 | 8453.865 | −16440.6 | 16738.14 | (N) | −16866.32 | 15346.41 | (P) | −16887.99 | 15305.67 | (BC) |
| Ethnicity | 1000 | −804.5152 | −6.846454 | 705.3772 | −2188.706 | 579.6757 | (N) | −2183.026 | 556.8843 | (P) | −2177.213 | 559.2528 | (BC) |
| Type of MS | 1000 | 1714.387 | 191.9886 | 5750.809 | −9570.664 | 12999.44 | (N) | −9150.42 | 13923.62 | (P) | −9373.646 | 13810.63 | (BC) |
| Age at interview | 1000 | −392.8838 | −2.470308 | 369.3031 | −1117.583 | 331.8151 | (N) | −1158.42 | 331.5103 | (P) | −1165.851 | 314.4072 | (BC) |
| Constant | 1000 | 20394.31 | −227.1215 | 26323.28 | −31260.95 | 72049.57 | (N) | −31201.81 | 75481.04 | (P) | −26689.37 | 78229.74 | (BC) |
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Note: N = normal. P = percentile. BC = bias corrected.
Bootstrap statistics: number of obs. = 86, replications = 1000.
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