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Table 1 Sample descriptive statistics

From: Low-level laser therapy effectiveness in reducing initial orthodontic archwire placement pain in premolars extraction cases: a single-blind, placebo-controlled, randomized clinical trial

 

N

Sex

Initial LIIa (mm)

Age (years)

Male

Female

Mean

SD

Mean

SD

Laser group

13

2

11

8.91

1.57

18.53

2.9

Placebo group

13

4

9

10.8

2.29

21.61

2.63

Signifigance

 

0.352b

0.022c

0.009c

Total sample

26

6

20

9.86

2.15

20.07

3.13

  1. a Little’s Irregularity Index
  2. bNon-significant
  3. cSignificant