Table 1.

Methodological quality of included studies

Study	Did study include a comparison group?a	Was the trial randomized?	Was the randomization procedure described and was it appropriate?	Was the treatment allocation concealed?	Were groups similar at baseline on prognostic indicators?	Were blind outcome assessments conducted?	Was the number of withdrawals/dropouts in each group mentioned?	In addition to stating the number of withdrawals/dropouts, were reasons given for each group?	Was an analysis conducted on the intention-to-treat sample?	Was a power calculation described?	Jadad score (revised, maximum score = 4)
Bazarko et al. (2013)	No	No	No	No	No	No	Yes	No	No	No	0
Beaumont et al. (2016b) a	No	No	No	No	No	No	No	No	No	No	0
Beaumont et al. (2016b) b	No	No	No	No	No	No	No	No	No	No	0
Beaumont (2016b) c	No	No	No	No	No	No	No	No	No	No	0
Beck et al. (2017)	Yes	Yes	No	No	Yes	No	No	No	No	No	1
Bond et al. (2013)	No	No	No	No	No	No	Yes	No	No	No	0
Brooker et al. (2013)	No	No	No	No	No	No	Yes	No	No	No	0
Crowder and Sears (2017)	Yes	Yes	No	No	Yes	No	Yes	No	No	No	1
Danilewitz et al. (2016)	Yes	Yes	No	No	Yes	No	Yes	No	No	No	1
Duarte and Pinto-Gouveia (2016)	Yes	No	No	No	Yes	Yes	Yes	Yes	No	No	2
Erogul et al. (2014)	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	No	Yes	4
Finlay-Jones et al. (2017)	No	No	No	No	No	No	Yes	No	No	Yes	0
Irving (2011)	No	No	No	No	No	No	Yes	Yes	No	No	1
Lopes et al. (2018)	No	No	No	No	No	No	Yes	No	No	Yes	0
Marx et al. (2014)	No	No	No	No	No	No	Yes	Yes	No	No	1
Mathad et al. (2017)	Yes	Yes	No	No	Yes	No	Yes	Yes	No	Yes	2
Pakenham (2015)	No	No	No	No	No	No	Yes	No	No	No	0
Penque (2009)	No	No	No	No	No	No	Yes	Yes	No	Yes	1
Raab et al. (2015)	No	No	No	No	No	No	No	No	No	No	0
Rao and Kemper (2017)	No	No	No	No	No	No	No	No	No	No	0
Rimes and Wingrove (2011)	No	No	No	No	No	No	Yes	Yes	No	No	1
Rodrigues et al. (2018)	No	No	No	No	No	No	Yes	Yes	No	No	1
Romcevich et al. (2018)	No	No	No	No	No	No	Yes	No	No	No	0
Runyan et al. (2016)	No	No	No	No	No	No	Yes	No	No	Yes	0
Scarlet et al. (2017)	No	No	No	No	No	No	Yes	Yes	No	No	1
Shapiro et al. (2007)	Yes	No	No	No	Yes	No	Yes	No	No	No	0
Shapiro et al. (2005)	Yes	Yes	No	No	No	No	Yes	Yes	No	No	2
Slatyer et al. (2017)	Yes	No	No	No	Yes	No	Yes	Yes	No	Yes	1
Stafford-Brown and Pakenham (2012)	Yes	No	No	No	Yes	No	Yes	Yes	Yes	No	1
Verweij et al. (2017)	Yes	Yes	Yes	No	Yes	No	Yes	Yes	Yes	Yes	3

Columns in italics constitute the revised Jadad Scale

^aNot part of Jadad scale, supplemented to provide context for scores