Clinical significance of prolonged chest pain in vasospastic angina

Table 2 Vasospastic angina-related symptoms and medications before admission

	Short-duration	Long-duration	P value	Low-frequency	High-frequency	P value
Chest symptoms
Only at rest (%)	88 (77)	48 (91)	0.0814	75 (85)	61 (77)	0.2360
At rest and exercise (%)	12 (11)	1 (2)		4 (5)	9 (11)
Only during exercise (%)	14 (12)	4 (8)		9 (14)	9 (11)
Maximum duration (min)	6 (5, 10)	30 (20, 60)	< 0.0001	10 (6, 20)	10 (5, 10)	0.3633
Frequency (/mo)	4 (2, 12)	4 (2, 10)	0.1833	2 (1, 4)	12 (8, 20)	< 0.0001
Frequency of VA (%)	0 (0)	2 (4)	0.0369	2 (3)	0 (0)	0.1776
Other serious symptoms (%)	3 (3)	13 (25)	< 0.0001	12 (14)	4 (5)	0.0602
No. taking vasodilators before admission	0.5 (0, 1)	0 (0, 1)	0.1786	0 (0, 1)	0 (0, 1)	0.4895

No.: Number; VA: Variant angina.