Effect of blood flow restriction on muscle strength and stability following foot and ankle injury: A systematic review

Table 2 Evaluation of study bias using the methodological index for non-randomized studies

Ref.	Study design	Study type (comparative or non-comparative)	1: clearly stated aim	2: Inclusion of consecutive patients	3: Prospective collection of data	4: End points appropriate to study aim	5: Unbiased assessment of study end point	6: Follow-up period appropriate to study aim	7: Less than 5% lost to follow up	8: Prospective calculation of the study size	9: Adequate control group	10: Contemporary groups	11: Baseline equivalence of groups	12: Adequate statistical analysis	Total score
Clark et al[20]	Prospective	Comparative	2	2	2	2	2	2	2	0	2	2	2	2	22
Killinger et al[21]	Prospective	Comparative	2	2	2	2	2	2	2	0	2	2	2	2	22
Larsen et al[22]	Prospective	Comparative	2	2	2	2	2	2	2	0	0	0	0	1	15
Yow et al[23]	Case Series	Non-Comparative	2	2	0	2	2	2	2	0	0	0	0	0	12
Mortensen et al[24]	Case Report	Non-Comparative	2	2	0	2	2	2	2	0	0	0	0	0	12