Efficacy of Low-Level Laser Therapy in Reducing Pain in the Initial Stages of Orthodontic Treatment

Table 3

Intergroup comparison of the elapsed time (hours) as a function of pain perception (initial, maximum, decline, and absence) (nonparametric Mann–Whitney test).

Pain perception (hours)	Laser group (n = 28)		Control group (n = 26)		P
	Median	IR	Median	IR
Initial	0.50	3.53	2.50	3.00	0.066
Maximum	4.40	24.00	15.88	18.75	0.026
Decline	17.25	46.84	40.59	34.00	0.025
Absence	31.23	95.91	89.00	114.67	0.008

Statistically significant difference ().