Table 4 Probability of coronary artery disease: reclassification table after addition of CTCS to the Diamond and Forrester (model 1)
Probability category based on model 1 Probability category based on model 1 + CTCS Total, n (%)
<30% ≥30–50% ≥50–70% ≥70%
<30%
 N (%) 51 (67.1) 19 (25.0%) 4 (5.2) 2 (2.6) 76 (29.9)
 Observed probability, % 11.8 36.8 50.0 100.0 22.4
≥30–50%
 N (%) 25 (39.7) 13 (20.6) 19 (30.2) 6 (9.5) 63 (28.4)
 Observed probability, % 0.0 23.1 68.4 50.0 30.2
≥50–70%
 N (%) 4 (11.1) 5 (13.9) 6 (16.7) 21 (58.3) 36 (14.2)
 Observed probability, % 25 80.0 50.0 66.7 61.1
≥70%
 N (%) 5 (6.3) 2 (2.5) 8 (10.1) 64 (81.0) 79 (31.1)
 Observed probability, % 0.0 50.0 37.5 95.3 82.3
 
Total
 N (%) 85 (33.5) 39 (15.4) 37 (14.6) 93 (36.6) 254 (100.0)
 Observed probability, % 8.2 38.5 56.8 86.0 48.4
CTCS computed tomography coronary calcium score