Table 2 The different comparison groups
From: Effectiveness of en masse versus two-step retraction: a systematic review and meta-analysis
Comparison no. | Space closure method | Anchorage reinforcement | VS | Space closure method | Anchorage reinforcement | Study included | Anchorage classification |
|---|---|---|---|---|---|---|---|
Comparison 1 | En masse retraction | Miniscrews | VS | Two-step retraction | Headgear | Kuroda et al. 2009 [23] | Maximum anchorage |
Comparison 2 | En masse retraction | Miniscrews | VS | Two-step retraction | Conventional anchorage | Al-Sibaie and Hajeer 2013 [18] | Maximum anchorage |
Davoody et al. 2012 [20] | Maximum anchorage | ||||||
Solem et al. 2013 [22] | Moderate anchorage | ||||||
Upadhyay et al. 2008 [17] | Maximum anchorage | ||||||
Upadhyay et al. 2008 [21] | Maximum anchorage | ||||||
Comparison 3 | En masse retraction | Headgear | VS | Two-step retraction | Headgear | Xu et al. 2010 [19] | Maximum anchorage |
Comparison 4 | En masse retraction | Conventional anchorage | VS | Two-step retraction | Conventional anchorage | Huang et al. 2010 [24] | Moderate anchorage |