Table 3 Predictive performance of the Classification and Regression Tree (CART) model on the learning sample (1993–1996) and validation sample (2001–2006) and their confidence intervals
Analysis | ROC curve area | Sensibility | Specificity | Global accuracy | Positive predictive value | Negative predictive value |
|---|---|---|---|---|---|---|
% (95% CI) | % (95% CI) | % (95% CI) | % (95% CI) | % (95% CI) | % (95% CI) | |
CART (learning sample) | 83 | 79 | 74 | 75 | 50 | 92 |
(79–88) | (71–87) | (69–78) | (71–79) | (42–58) | (87–95) | |
CART (validation) | 66 | 52 | 66 | 62 | 36 | 79 |
(61–70) | (45–60) | (61–70) | (58–66) | (30–42) | (75–83) |