Progress in Orthodontics

Table 1 Descriptive statistics for pain values

From: Effect of single-dose low-level helium-neon laser irradiation on orthodontic pain: a split-mouth single-blind placebo-controlled randomized clinical trial

Day	Treatment	N	Mean	SD	CV	Min	Q1	Med	Q3	Max	95 % CI
1	Placebo	27	6.63	1.94	29.3	2.0	5.0	7.0	8.0	10.0	5.86	7.40
1	Laser	27	4.59	1.39	30.4	2.0	4.0	5.0	5.0	7.0	4.04	5.14
2	Placebo	27	5.22	0.93	17.9	3.0	5.0	5.0	6.0	7.0	4.85	5.59
2	Laser	27	3.74	1.26	33.6	1.0	3.0	4.0	5.0	6.0	3.24	4.24
4	Placebo	27	2.81	0.96	34.2	1.0	2.0	3.0	4.0	5.0	2.43	3.20
4	Laser	27	1.89	0.89	47.2	0.0	2.0	2.0	2.0	3.0	1.54	2.24
7	Placebo	27	1.59	0.93	58.4	0.0	1.0	2.0	2.0	3.0	1.22	1.96
7	Laser	27	1.19	0.83	70.3	0.0	1.0	1.0	2.0	3.0	0.86	1.52

SD standard deviation, CV coefficient of variation (%), Min minimum, Q1 25^th percentile, Med median, Q3 75^th percentile, Max maximum, CI confidence interval for the mean

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