Table 1:

Numbers of Samples at Different Pain Levels in Each Visit.

Pain Level	0	1	2	3	4	5	6	7	8	9	10
V1	16	12	18	28	31	26	26	19	24	15	11
V2	4	18	24	40	21	23	16	13	14	8	4
V3	166	17	3	1	0	0	0	0	0	0	0