		Pain level^a at V2, N (%)
V1, V2	Pain level^a at V1	0 - 1	2 - 3	p-value
7, 15	0 - 1	77 (95.1)	4 (4.9)	<0.001
7, 15	2 - 3	38 (55.9)	30 (44.1)	<0.001
15, 30	0 - 1	111 (97.4)	3 (2.6)	<0.001
15, 30	2 - 3	26 (78.8)	7 (21.2)	<0.001
30, 60	0 - 1	121 (99.2)	1 (0.8)	0.03
30, 60	2 - 3	7 (77.8)	2 (22.2)	0.03
60, 90	0 - 1	101 (100)	0	0.32
60, 90	2 - 3	1 (50.0)	1 (50.0)	0.32
90, 120	0 - 1	80 (100)	0	-
90, 120	2 - 3	0	1 (100)	-