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Table 4 Cox proportional hazard models

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

  Model 1 Model 2 Model 3 Model 4 Model 5
Age 0.886 0.837 0.819 0.657* 0.672*
Female 1.071 1.288 1.164 1.156  
Caucasian 1.004 1.144 1.245 1.477  
Mandible   0.480+ 0.756 0.829  
Crowding (LII - mm)    0.544* 0.549+ 0.513+
PBM     4.661** 4.397**
Arches 28 28 28 28 28
Failures 28 28 28 28 28
N 37 37 37 37 37
dF 3 4 5 6 3
chi2 0.813 3.549 9.315 17.725 16.786
  1. + p < 0.010, * p < 0.05 ** p < 0.01