Figure 2
The flow begins with two text boxes at the top, arranged horizontally. The box on the left is labeled “Research articles searched through database search (n equals 211)”, and the box on the right is labeled “Research articles searched through Google Scholar (n equals 177)”. From these two boxes, a downward arrow extends and points to a text box labeled “Research articles after removing duplicates (n equals 189)”. From “Research articles after removing duplicates (n equals 189)”, another downward arrow extends and points to a text box labeled “Research articles retained for eligibility (n equals 55)”. To the right of this downward arrow, a text box labeled “Articles excluded related to other disciplines except Performance (n equals 134)” is shown, with a leftward arrow pointing toward the downward arrow. From “Research articles retained for eligibility (n equals 55)”, a downward arrow extends and points to a text box labeled “Research articles for screening (n equals 36) (observation equals 13010)”. To the right of this downward arrow, a text box labeled “Articles excluded (n equals 19): Exclusion includes qualitative research, no data for direct effect, same data, and low-quality papers.” is present, with a leftward arrow pointing toward the downward arrow.PRISMA flow diagram