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Progress in Orthodontics

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
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