Method
A fixed-effects model meta-analysis (Hedges & Vevea, 1998) was conducted to test the
preceding hypotheses.1 Meta-analysis is an approach for aggregating the results from
a body of research (Hedges & Olkin, 1985; Hunter, Schmidt, & Jackson, 1982; Lipsey
& Wilson, 2001). Meta-analysis serves two important functions by making it possible