Fig. 5

A Proportions of studies reporting favorable outcomes (black bar segments) or equivocal/unfavorable outcomes (gray bar segments), with comparison between studies published in open access vs. traditional journals. Outcome proportions were not significantly different between journal types. B Proportions of studies reporting Level I evidence (black bar segments), Level II evidence (light gray bar segments) or Level III evidence (dark gray bar segments), with comparison between studies published in open access vs. traditional journals. Level of evidence distributions were not significantly different between journal types