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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
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
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
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
Laser 27 1.19 0.83 70.3 0.0 1.0 1.0 2.0 3.0 0.86 1.52
  1. SD standard deviation, CV coefficient of variation (%), Min minimum, Q1 25th percentile, Med median, Q3 75th percentile, Max maximum, CI confidence interval for the mean