Table 2.

Low Pretest probability vs. Moderate/High Pretest Probability Subjects

	Low Pretest Probability	Moderate/High Pretest Probability	Total	RR^* Low/MH (95% CI)	P Value
Stress tested (%)	155/305 (51%)	120/238 (50%)	275/543 (51%)	1.01 (0.852, 1.192)	.93^{^†}
Positive or equivocal stress tests/stress tested (%)	27/155 (17%)	32/120 (27%)	59/275 (21%)	0.653 (0.415, 1.028)	.07^{^†}
Positive coronary angiogram or CT/ positive or inconclusive stress test (%)	0/16 (0%)	14/29 (48%)	14/45 (31%)	0.061 (0.004, 0.957)	.001+

Testing results by Duke clinical score pretest probability category.
↵* Relative risk of low pretest probability category compared to moderate/high pretest probability group.
↵† P-value based on χ².
+ P-value based on Fisher's exact test.
CI, confidence interval; CT, computed tomography.