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Table 2 Pairwise comparisons between laser and placebo-matched sides presented as mean pain difference in 27 patients (control pain minus experimental pain)

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 Groups N Mean SD 95 % CI P
1 Control–laser 27 2.04 1.60 1.40 2.67 <0.0001
2 Control–laser 27 1.48 1.31 0.96 2.00 <0.0001
4 Control–laser 27 0.93 0.92 0.56 1.29 <0.0001
7 Control–laser 27 0.41 0.75 0.11 0.70 0.0088
  1. SD standard deviation, CI confidence interval for the pain difference