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Table 3 Reclassification analyses

From: Comparing ultrasonographically assessed carotid and abdominal aorta plaques in cardiovascular disease risk estimation

 

C-index (95% CI)

IDI (95% CI)

NRIcont, (95% CI)

NRIcat. (95% CI)

CV events (fatal + non-fatal)

    

Baseline model

0.718 (0.684–0.751)

   

+ carotid plaque burden*

0.743 (0.710–0.776)

0.028 (0.017–0.040)

p<0.001

0.415 (0.274–0.556)

p<0.001

0.017 (-0.007–0.040)

p=0.168

+ abdominal aorta plaque burden†

0.721 (0.688–0.754)

0.004 (-0.001–0.009)

p=0.104

0.171 (0.029–0.314)

p=0.019

0.008 (-0.007–0.023) p=0.303

+ carotid plaques (yes or no)

0.734 (0.700–0.767)

0.016 (0.008–0.024)

p<0.001

0.526 (0.388–0.663)

p<0.001

0.002 (-0.027–0.031)

p=0.898

+ abdominal aorta plaques (yes or no)

0.722 (0.689–0.756)

0.004 (0.000–0.008)

p=0.047

0.05 (-0.077–0.177)

p=0.441

0.003 (-0.015=0.020)

p=0.775

Fatal CV events

    

Baseline model

0.767 (0.714–0.820)

   

+ carotid plaque burden*

0.801 (0.754–0.848)

0.035 (0.011–0.038)

p<0.001

0.702 (0.486–0.917)

p<0.001

0.089 (-0.021–0.198)

p=0.112

+ abdominal aorta plaque burden†

0.768 (0.716–0.821)

0.004 (-0.002–0.010)

p=0.195

0.221 (-0.007–0.449)

p=0.057

-0.018 (-0.063–0.027)

p=0.434

+ carotid plaques (yes or no)

0.791 (0.743–0.839)

0.015 (0.005–0.025)

p=0.003

0.608 (0.404–0.813)

p<0.001

0.098 (-0.008–0.204)

p=0.069

+ abdominal aorta plaques (yes or no)

0.768 (0.715–0.821)

0.000 (-0.002–0.019)

p=0.897

0.022 (-0.178–0.222)

p=0.832

-0.003 (-0.010–0.003)

p=0.317

  1. Baseline model: age, sex, systolic blood pressure, smoking, LDL cholesterol and diabetes. CI, confidence interval; IDI, integrated discrimination index; NRIcont., net reclassification index (continuous); NRIcat., net reclassification index (categorical, cutoff 10%). *carotid plaque burden was visually binned into three groups of equal percentiles based on scanned cases: 0 plaques, 1 plaque, and 2 or more plaques. †femoral plaque burden was visually binned into three groups of equal percentiles based on scanned cases: 0–3 plaques, 4–10 plaques, and 11 or more plaques