Extraoral low-level laser therapy can decrease pain but not edema and trismus after surgical extraction of impacted mandibular third molars: a randomized, placebo-controlled clinical trial

Table 3 Pairwise comparisons of trismus at different time points in the two groups

Time (I)	Time (J)	Laser			Placebo
Time (I)	Time (J)	Mean difference	Std. deviation	P value	Mean difference	Std. deviation	P value
Before surgery	Immediately after surgery	0.372^*	0.114	0.020	0.420^*	0.140	0.037
	After 2 days	1.216^*	0.129	0.0001	1.788^*	0.101	0.0001
	After 7 days	0.480^*	0.075	0.0001	0.920^*	0.100	0.0001
Immediately after surgery	After 2 days	0.844^*	0.120	0.0001	1.368^*	0.117	0.0001
Immediately after surgery	After 7 days	0.108	0.138	0.999	0.500^*	0.170	0.042
After 2 days	After 7 days	− 0.736^*	0.102	0.0001	− 0.868^*	0.101	0.0001

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