Clinical significance of prolonged chest pain in vasospastic angina

Table 4 Vasospastic angina status at follow-up and prognosis

	Short-duration	Long-duration	P value	Low-frequency	High-frequency	P value
No. taking vasodilators at discharge	1 (1, 1)	1 (1, 1)	0.9199	1 (1, 1)	1 (1, 1)	0.7862
Median period of follow-up (mo)	58 (36, 75)	56 (34, 67)	0.3505	54 (20, 75)	59 (41, 71)	0.4678
Follow-up
No. of recent follow-ups (a, %)	82 (71.9)	40 (75.5)	0.7547	60 (68.2)	62 (78.5)	0.2434
No. of deaths during follow-up (b, %)	5 (4.4)	3 (5.6)		4 (4.5)	4 (5.0)
No. of follow-ups before 2018 (c, %)	27 (23.7)	10 (18.9)		24 (27.3)	13 (16.5)
No. of anginal attacks (/mo) in patients (a)	0 (0, 1)	0 (0, 1)	0.4574	0 (0, 1)	0 (0, 2.5)	0.1305
No. taking vasodilators among patients (a)
No. taking vasodilators among patients (a) at follow-up	1 (1, 2)	1 (1, 2)	0.2131	1 (1, 2)	1 (1, 2)	0.7408
Prognosis among patients (a) and (b)
Cardiac death (%)	0 (0)	0 (0)		0 (0)	0 (0)
Noncardiac death (%)	5 (6)	3 (7)	0.7837	4 (6)	4 (6)	0.9642
Cardiac events (%)	13 (15)	4 (9)	0.3695	6 (9)	11 (17)	0.2176

No.: Number; NS: Not significant.