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Table 3 LII measurements in millimeters (mm) at T0 and T1 for each group

From: Intraoral photobiomodulation-induced orthodontic tooth alignment: a preliminary study

   # of Arches Mean (SD) Median Min–Max p-value*
T0
  Control Total 10 5.77 (1.57) 5.80 3.70–8.80 0.1572
  Upper 3 5.20 (1.30) 5.90 3.70–6.00  
  Lower 7 6.01 (1.70) 5.70 4.20–3.70  
  PBM Total 18 7.27 (2.99) 6.32 3.72–14.58 0.1572
  Upper 10 7.91 (3.41) 6.59 4.36–14.58  
  Lower 8 6.48 (2.33) 6.06 3.72–10.60  
T1
  Control Total 10 0.33 (0.38) 0.25 0.00–1.00 0.3293
  Upper 3 0.33 (0.58) 0.00 0.00–1.00  
  Lower 7 0.33 (0.33) 0.50 0.00–0.80  
  PBM Total 18 0.47 (0.41) 0.58 0.00–1.17 0.3293
  Upper 10 0.44 (0.39) 0.60 0.00–0.99  
  Lower 8 0.50 (0.46) 0.55 0.00–1.17  
  1. *p-value based on two-tailed Mann-Whitney U. A p-value cutoff of 0.05 is used to determine significance