Table 2.

Methodological quality assessment per intervention.

Study (year)	Criteria
	Eligibility criteria	Method of randomization	Single-blinded	Description of intervention	Description of withdrawals	Timing of assessment	Sample size calculation	Intention-to-treat analysis
Bond (2010) [53]	✓	✓	✓	✓	x	✓	✓	x
Tang (2013) [54]	✓	✓	✓	✓	✓	x	✓	✓
Heisler (2014) [55]	x	✓	x	✓	✓	✓	✓	x
Glasgow (2012) [56]	✓	✓	x	✓	✓	✓	✓	✓
McMahon (2012) [57]	✓	✓	x	✓	✓	✓	x	✓
McKay (2001) [50]	✓	✓	x	✓	✓	✓	x	x
McKay (2002) [58]	✓	x	x	✓	✓	✓	x	x
Lorig (2010) [59]	✓	✓	✓	✓	✓	✓	✓	x
Nobis (2015) [60]	✓	✓	x	✓	✓	✓	✓	x
Van Bastelaar (2011) [61]	✓	✓	✓	✓	✓	✓	✓	✓
Fisher (2013) [62]	✓	✓	✓	✓	✓	✓	x	x
Wangberg (2008) [63]	✓	x	x	✓	x	x	✓	x
Hunt (2014) [52]	✓	✓	x	✓	✓	✓	x	x
Smith (2000) [64]	✓	✓	x	✓	✓	✓	x	x
Pacaud (2012) [65]	x	x	x	x	x	✓	x	✓
Fonda (2009) [66]	x	x	x	✓	x	✓	x	x