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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