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Table 3 Quality assessment

From: Effect of protraction facemask on the temporomandibular joint: a systematic review

Author Study design Study type Definitive grade
Mandall (2010) and Mandall (2012) Prospective Randomized controlled trial A
Kurt (2010) Prospective Randomized controlled trial A
Ngan (1997) Prospective Before-after study B
Franchi (1998) and Baccetti (1998) Prospective Controlled trial B
Gallagher (1998) Prospective Cohort study B
EI (2010) Prospective Randomized controlled trial A
Gong (2014) Prospective Before-after study C
Yao (2001) Prospective Before-after study C
Baccetti (1999) Prospective Cohort study B
Baccetti (2000) Prospective Cohort study B
Chang (2006) Retrospective Cohort study B
Franchi (2014) Retrospective Cohort study B
Lee (2016) Retrospective Before-after study C