Table 4. Quality assessment of shortlisted studies.

Studies	Scoring classification	Total
Liao et al., 2019; Yeomans, Zschaler & Coate, 2019; Carter, Hundhausen & Adesope, 2017; Iqbal Malik & Coldwell-Neilson, 2017; Pereira et al., 2020	Exactly 5	5
McCall & Kölling, 2019; Ullah et al., 2019; Ureel & Wallace, 2019; Albluwi, 2018; Bhatia, Kohli & Singh, 2018; Lagus et al., 2018; Lin et al., 2018; Turner, Pérez-Quiñones & Edwards, 2018; Wainer & Xavier, 2018; Castro-Wunsch, Ahadi & Petersen, 2017; Ahadi, Hellas & Lister, 2017; Echeverría et al., 2017; Hsiao, Huang & Murphy, 2017; Malliarakis, Satratzemi & Xinogalos, 2016; Scott et al., 2015; Xinogalos, 2015; Allinjawi, Al-Nuaim & Krause, 2014; Omer, Farooq & Abid, 2020	Greater or equal to 4 and less than 5	18
Azcona, Hsiao & Smeaton, 2018; Esteero et al., 2018; Gomes & Correia, 2018; King, 2018; Koong et al., 2018; Premchaiswadi, Porouhan & Premchaiswadi, 2018; Dorodchi, Dehbozorgi & Frevert, 2017; España-Boquera et al., 2017; Estey, Keuning & Coady, 2017; Fu et al., 2017; Kumar, 2017; Seanosky et al., 2017; Seeling & Eickholt, 2017; Gomes, Correia & Abreu, 2016; Seeling, 2016; Simkins & Decker, 2016; Ahadi et al., 2015; Ashenafi, Riccardi & Ronchetti, 2015; Carter, Hundhausen & Adesope, 2015; Hilton & Rague, 2015; Janke, Brune & Wagner, 2015; Rosiene & Rosiene, 2015; Su et al., 2015; Ureel & Wallace, 2015; Wood & Keen, 2015; Edwards, Shams & Estep, 2014; Edwards, Tilden & Allevato, 2014; Heinonen et al., 2014, Hijon-Neira et al., 2014; Rubio et al., 2014; Watson, Li & Godwin, 2014; Zur & Vilner, 2014; Ninrutsirikun et al., 2020	Greater or equal to 3 and less than 4	33
Chaweewan et al., 2018; Santana, Figueredo & Bittencourt, 2018; Ahmad et al., 2017; al-Rifaie, Yee-King & d’Inverno, 2017; Delev & Gjorgjevikj, 2017; Berges et al., 2016; Funabiki, Ishihara & Kao, 2016; Doshi, Christian & Trivedi, 2014; Chung & Hsiao, 2020; Effenberger, Pelánek & Čechák, 2020	Greater than 2 and less than 3	10