Table 3.
Statistical net reclassification improvement and integrated discrimination improvement analysis between the groups shown in Table 2
| NRI (95%CI) | P‐value | IDI (95%CI) | P‐value | |
|---|---|---|---|---|
| A : B | 0.230 (0.010–0.450) | 0.041 | 0.019 (0.004–0.033) | 0.013 |
| A : C | 0.775 (0.572–0.979) | <0.001 | 0.129 (0.095–0.163) | <0.001 |
| A : D | 0.652 (0.454–0.849) | <0.001 | 0.085 (0.059–0.111) | <0.001 |
| C : E | 0.269 (0.053–0.484) | 0.014 | 0.025 (0.010–0.040) | 0.001 |
| D : F | 0.411 (0.196–0.626) | <0.001 | 0.042 (0.024–0.060) | <0.001 |
Statistical significance between the groups (A, B, C, D, E and F, shown in Table 2) was examined using net reclassification improvement (NRI) and integrated discrimination improvement (IDI) analysis. A, standard risk factors only; B, standard risk factors + common carotid artery; C, standard risk factors + maximum of the plaque thickness; D, standard risk factors + sum of the plaque thickness; E, standard risk factors + common carotid artery * maximum of the plaque thickness; F, standard risk factors + common carotid artery * sum of the plaque thickness. CI, confidence interval.