Effects on attitudes. Victor Orozco-Olvera Fuyuan Shen Lucie Cluver 10.1371/journal.pone.0209969.g004 https://plos.figshare.com/articles/figure/Effects_on_attitudes_/7708844 <p>Positive values represent intended effects. Standardized Mean Differences of Secondary Outcomes, 95% Confidence Interval.</p> 2019-02-12 18:34:20 quasi-experimental studies 2017. Effect sizes aggregated sample size entertainment education narratives effect sizes SMD CI mass media programs mass media entertainment youth 1985-2017 Background Risky STI