Skip to main content
Fig. 2 | Head & Face Medicine

Fig. 2

From: Does low level laser therapy relieve the pain caused by the placement of the orthodontic separators? ----a meta-analysis

Fig. 2

Risk of bias for every study. Of the six included studies, two [13, 19] of them were judged to have a low risk of bias because all the items were of low risk of bias and one study [19] is a random, triple-blinding, placebo control clinic trail while the other one [13] is a random double-blinding, placebo control clinic trail. Two [14, 20] of the six studies were judged to have an unclear risk of bias, because the authors failed to describe the method of randomization and had no report of the allocation concealment. At the same time, the study of Won Tae Kim, et al. [14] was judged to have unclear bias on the item of “other bias” because the application of the laser was performed by the subjects at home, so there may be compliance bias. Two studies [15, 29] were judged to have a high risk of bias because one of the studies [15] used inappropriate method of randomization and there was a subject drop out without details description in the study of Esper MA, et al. [29]

Back to article page