Table 2.

Two-by-two comparisons of visual analog scale scores between the study groups at different time intervals (confidence interval 95%)

Group	Time interval (P)
	Before treatment	15min after the first session	15min after the second session	1week after treatment ended	1 month after treatment ended	2 months aftertreatment ended
810-nm laser group with the control group	0.456	0.022	<0.001	<0.001	<0.001	<0.001
980-nm laser group with the control group	0.652	0.002	<0.001	<0.001	<0.001	<0.001
810-nm laser group with the 980-nm laser group	0.187	0.352	0.518	<0.167	0.726	0.539