Table 2.

 Models to predict 30 day cardiovascular death and myocardial infarction in study of prognostic capabilities of coronary computed tomographic angiography carried out before non-cardiac surgery

Model type	No of patients	No with event (%)	Hazard ratio (95% CI)	P value
Revised cardiac risk index scores as only independent variables*
RCRI scores (overall P<0.001†):
0	320	15 (4.7)	1.00	—
1	407	29 (7.1)	1.53 (0.82 to 2.86)	0.178
2	178	19 (10.7)	2.37 (1.20 to 4.66)	0.013
≥3	50	11 (22.0)	5.25 (2.41 to 11.43)	<0.001
CCTA findings as only independent variables*
CCTA findings (overall P<0.001‡):
Normal	81	3 (3.7)	1.00	—
Non-obstructive	371	19 (5.1)	1.40 (0.41 to 4.72)	0.590
Obstructive	357	29 (8.1)	2.26 (0.69 to 7.41)	0.180
Extensive obstructive	146	23 (15.8)	4.50 (1.35 to 15.00)	0.014
Combined CCTA findings and revised cardiac risk index scores§
RCRI scores (overall P=0.005†):
0	320	15 (4.7)	1.00	—
1	407	29 (7.1)	1.39 (0.74 to 2.61)	0.300
2	178	19 (10.7)	1.88 (0.94 to 3.79)	0.076
≥3	50	11 (22.0)	4.02 (1.80 to 8.98)	<0.001
CCTA findings (overall P=0.014‡):
Normal	81	3 (3.7)	1.00	—
Non-obstructive	371	19 (5.1)	1.51 (0.45 to 5.10)	0.509
Obstructive	357	29 (8.1)	2.05 (0.62 to 6.74)	0.238
Extensive obstructive	146	23 (15.8)	3.76 (1.12 to 12.62)	0.032

CCTA=coronary computed tomographic angiography; RCRI=revised cardiac risk index.

*C=0.62, 95% confidence interval 0.56 to 0.68.

†Overall P value for four category RCRI.

‡Overall P value for four category CCTA.

§C=0.66, 95% confidence interval 0.60 to 0.73.