“…According to the Z test performed to determine the significance of the Hedges g values calculated according to the random effect model, it can be said that the difference in effect size was significant since p <0.05 was found in 19 studies (Baykara Pehlivan, 2010; Pektaş and Kamer, 2011;Tümkaya, 2011;Aydın and Sağlam, 2012;Gökçe and Sezer, 2012;Gür Erdoğan and Zafer Güneş, 2012;Kızıltaş et al, 2012;Aydın and Tekneci, 2013;Çağlar, 2013;İpek et al, 2015;Karatekin et al, 2015;İlter and Köksalan, 2011;Uğurlu and Polat, 2011), but because it was p> Korkmaz and Usta, 2010;Kayan-Fadlelmula, 2013;Kahyaoğlu et al, 2013;Tanel and Tanel, 2013;Tunçeli, 2013;Akgün and Özgür, 2014;Taşdemir, 2014;Dinçer and Yılmaz, 2015;Kesen and Polat, 2014), it was not statistically significant. The z-test calculations performed to determine the statistical significance of the effect size in the random effect model were found to be z = 6,336 and p = 0,000.…”