Table 2.

Diagnostic performance of cardiac risk factors in percent (95% CI) for ACS within 30 days

	Sensitivity	Specificity	LR+	LR-
Age (years)
<40	0.3 (0.0-3.2)	82 (80–85)	0.02 (0.00-0.31)	1.2 (1.2- 1.2)
40-65	34 (27–42)	58 (55–61)	0.8 (0.6-1.0)	1.1 (1.0-1.3)
>65	66 (58–73)	60 (57–63)	1.6 (1.4-1.9)	0.6 (0.5-0.7)
>80	25 (19–33)	86 (84–88)	1.8 (1.3-2.5)	0.9 (0.8-1.0)
Risk factors
Known PAD	4 (2–9)	98 (97–99)	2.0 (0.8-5.1)	1.0 (0.9-1.0)
Diabetes	29 (23–37)	88 (85–89)	2.4 (1.8-3.2)	0.8 (0.7- 0.9)
Previous stroke	16 (11–23)	92 (90–94)	2.1 (1.4-3.2)	0.9 (0.8-1.0)
Known CAD	51 (43–59)	74 (71–76)	2.0 (1.6-2.4)	0.7 (0.6-0.8)
Known heart failure	9 (5–15)	90 (88–91)	0.9 (0.5-1.5)	1.0 (1.0-1.1)
Male gender	75 (67–81)	47 (44–50)	1.4 (1.3-1.6)	0.5 (0.4- 0.7)

LR, Likelihood ratio; PAD, peripheral artery disease; CAD, Coronary artery disease.