Review
Copyright ©2014 Baishideng Publishing Group Inc.
World J Methodol. Sep 26, 2014; 4(3): 151-162
Published online Sep 26, 2014. doi: 10.5662/wjm.v4.i3.151
Table 3 Levels of evidence for therapies in orthodontics
LevelTherapy
Prospective Meta analysis
Meta analysis
1aSR (with homogeneity) of RCTs
1bIndividual RCT
2aSR (with homogeneity) of cohort studies
2bIndividual cohort study, CCTs and low quality RCT
3aSR (with homogeneity) of case-control studies
3bIndividual Case-Control study, low quality cohort study and short time split mouth design
4Case-series, low quality case-control study and non systematic review
5Expert opinion