Table 2.
Calibration slope required | Minimum C statistic required | Joint predicted probability of meeting criteria in new population |
||
---|---|---|---|---|
Strategy (1): Develop using logistic regression and implement with intercept estimated in external validation study |
Strategy (2): Develop using logistic regression and implement with average study intercept taken from developed model |
Strategy (3): Develop using logistic regression and implement with intercept taken from a study used in development data with a similar prevalence |
||
0.9–1.1 | 0.70 | 0.027 | 0.037 | 0.037 |
0.8–1.2 | 0.70 | 0.146 | 0.158 | 0.156 |
0.9–1.1 | 0.65 | 0.427 | 0.413 | 0.409 |
0.8–1.2 | 0.65 | 0.728 | 0.712 | 0.707 |
Abbreviation: DVT, deep vein thrombosis.