Appendix II. Qualitative Quality Assessment Table.

Higher scores reflect less risk of bias in the study design and analysis.

Author / Citation	Q1	Q2	Q3	Q4	Q5	Q6	Q7	Q8	Q9	Q10	Total score
Barrera [25]	2	2	2	2	2	2	2	0	2	2	0.90
Carlsen [57]	2	2	2	2	2	2	1	2	2	1	0.90
D’Urso [42]	2	2	2	2	2	2	2	0	2	1	0.85
Jenholt-Nolbris [68]	2	1	2	0	2	2	1	0	1	0	0.55
Kaatsız [56]	2	2	2	2	2	2	1	1	2	2	0.90
Løkkenberg [41]	2	2	2	2	1	2	1	0	2	2	0.80
Long [53]	2	2	2	2	2	2	2	2	2	2	1.00
McGrath [54]	2	2	2	2	2	2	1	0	1	0	0.70
Murray [34]	2	2	2	2	2	2	1	0	2	2	0.85
O’Shea [59]	2	2	2	2	2	1	2	0	2	2	0.85
Pariseau [37]	2	2	2	2	2	2	2	0	2	2	0.90
Plessis [66]	2	2	2	2	1	1	1	0	1	1	0.65
Prchal [26]	2	2	2	2	1	2	1	0	2	2	0.80
Samson [55]	2	2	2	2	2	2	2	0	2	2	0.90
Sidhu [60]	2	2	2	2	2	2	2	2	2	2	1.00
Sloper [13]	2	2	2	2	2	2	1	0	2	2	0.85
Tasker [61]	2	2	2	2	2	2	0	2	2	2	0.90
Toft [64]	2	2	2	2	1	1	1	0	2	2	0.75
Van Schoors [72]	2	2	2	1	2	2	1	0	2	2	0.80
vonEssen [62]	2	2	2	2	2	2	1	0	2	2	0.85
Wakefield [63]	2	2	2	2	2	2	1	0	2	2	0.85