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 5 Pairwise comparisons of pain scores in the two groups at different time points

Time (I)	Time (J)	Laser			Placebo
Time (I)	Time (J)	Mean difference	Std. deviation	P value	Mean difference	Std. deviation	P value
2	3	0.960^*	0.179	0.0001	0.840^*	0.174	0.001
	4	1.640^*	0.209	0.0001	1.560^*	0.212	0.0001
	5	1.840^*	0.203	0.0001	2.600^*	0.218	0.0001
	6	2.000^*	0.183	0.0001	3.880^*	0.308	0.0001
	7	2.040^*	0.173	0.0001	4.960^*	0.253	0.0001
3	4	0.680^*	0.153	0.003	0.720^*	0.208	0.0321
	5	0.880^*	0.138	0.0001	1.760^*	0.157	0.0001
	6	1.040^*	0.163	0.0001	3.040^*	0.253	0.0001
	7	1.080^*	0.166	0.0001	4.120^*	0.198	0.0001
4	5	0.200	0.090	0.533	1.040^*	0.137	0.0001
	6	0.360	0.134	0.201	2.320^*	0.233	0.0001
	7	0.400	0.147	0.184	3.400^*	0.236	0.0001
5	6	0.160	0.093	0.999	1.280^*	0.215	0.0001
5	7	0.200	0.107	0.999	2.360^*	0.202	0.0001
6	7	0.040	0.035	0.999	1.080^*	0.176	0.0001

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