Comparison of ROC curves of PEI to differentiate between culprit and nonculprit plaques between 4 postcontrast phases
| Variables | Difference between AUC area | 95% CI | z statistic | P Value |
|---|---|---|---|---|
| PEI 1st versus PEI 2nd | 0.060 ± 0.026 | 0.009–0.112 | 2.293 | .022 |
| PEI 1st versus PEI 3rd | 0.071 ± 0.039 | −0.005–0.148 | 1.824 | .068 |
| PEI 1st versus PEI 4th | 0.043 ± 0.038 | −0.032–0.118 | 1.131 | .258 |
| PEI 2nd versus PEI 3rd | 0.011 ± 0.025 | −0.038–0.060 | 0.444 | .657 |
| PEI 2nd versus PEI 4th | 0.017 ± 0.027 | −0.036–0.070 | 0.628 | .530 |
| PEI 3rd versus PEI 4th | 0.028 ± 0.024 | −0.020–0.076 | 1.151 | .249 |