Table 1.

Clinic characteristics of participants in different groups.

Group	Intervention	Age		Gender		Pain intensity (NRS: 0–10)	Pain history			Pain characteristics
		Mean	SD	Men	Women		≤ 1 month	1–6 month	≥ 6 month	Intermittent	Persistent
Masseter myalgia	PBM	34.8	11.4	6	19	5.3	10	6	9	13	12
	Placebo	33.2	13.6	8	17	4.4	6	13	6	16	9
TMJ arthralgia	PBM	35.0	12.2	4	21	5.2	8	7	10	15	10
	Placebo	34.8	13.2	6	19	4.1	7	10	8	13	12

PBM: photobiomodulation.