Table 2. Baseline characteristics, investigations, and outcomes for patients referred for further evaluation of chest pain.

Characteristic	Typical (N=24)	Atypical (N=60)	Non-anginal (N=74)
Known coronary artery disease, n (%)	10 (42)	14 (23)	15 (20)
Mean number of cardiovascular risk factors ± SD	2.3 ± 1.3	1.8 ± 1.0	1.5 ± 1.1
Investigations, n (%)
	CTCA	5 (21)	26 (43)	11 (15)
	Stress testing	6 (25)	4 (7)	4 (5)
	Invasive coronary angiography	8 (33)	5 (8)*	2 (3)
Echocardiography	10 (42)	23 (38)	28 (38)
Cardiac magnetic resonance imaging	1 (4)	0 (0)	1 (1)
Ambulatory blood pressure monitor	0 (0)	1 (3)	2 (3)
Holter monitor	0 (0)	0 (0)	2 (3)
No additional investigations	7 (29)	16 (27)	31 (42)
Safety outcomes, n (%)
	Direct admission from clinic	4 (17)	2 (3)	1 (1)
	90-day mortality	0 (0)	0 (0)	0 (0)
	90-day major adverse cardiovascular events	1 (4)	0 (0)	0 (0)
90-day all-cause unscheduled re-presentation	5 (21)	11 (18)	12 (16)
90-day unscheduled re-presentation with same presenting complaint	2 (8)	12 (20)	6 (8)
Diagnoses, n (%)
	Unstable angina	2 (8)	1 (3)	0 (0)
	Stable angina	14 (58)	20 (33)	3 (4)
	Other cardiac diagnosis Atrial fibrillation Hypertension Heart failure Pericarditis Valvular disease	2 (8) 1 (4) 0 (0) 1 (4) 0 (0) 1 (4)	2 (3) 0 (0) 2 (3) 0 (0) 0 (0) 0 (0)	7 (10) 2 (3) 2 (3) 1 (1) 2 (3) 0 (0)
Non-cardiac pain	5 (21)	36 (60)	64 (87)
Did not attend	0 (0)	1 (3)	0 (0)

*One patient presenting with atypical symptoms was offered, but declined, invasive coronary angiography.

Key: CTCA = computed tomographic coronary angiography; SD = standard deviation