Meta-Analyses
                            
                                
                                
                                
                                
                                
                                
                                
                                
                                
                                
                            
                                
                                    | Dissertation | 
                                    Hartley | 
                                    USA | 
                                    Meta-analysis of the effects of individually paced instruction in mathematics | 
                                    1977 | 
                                    Effects on tutors in math | 
                                    29 | 
                                    0 | 
                                    18 | 
                                    0.58 | 
                                
                                
                                    | The Journal of Special Education | 
                                    Cook, Scruggs, Mastropieri & Casto | 
                                    USA | 
                                    Handicapped Students as Tutors | 
                                    1985 | 
                                    Handicapped as tutors | 
                                    19 | 
                                    0 | 
                                    49 | 
                                    0.53 | 
                                
                                
                                    | American Educational Research Journal | 
                                    Cohen, Kulik, & Kulik | 
                                    USA | 
                                    Educational Outcomes of Tutoring: A Meta-analysis of Findings | 
                                    1982 | 
                                    Effects on tutors | 
                                    65 | 
                                    0 | 
                                    33 | 
                                    0.33 | 
                                
                                
                                    | School Psychology International | 
                                    Leung | 
                                    Hong Kong | 
                                    An updated meta-analysis on the effect of peer tutoring on tutors' achievement. | 
                                    2019 | 
                                    Peer tutors on tutor's achievement | 
                                    16 | 
                                    0 | 
                                    16 | 
                                    0.43 | 
                                
                            
                                | TOTAL/AVERAGE | 
                                129 | 
                                0 | 
                                116 | 
                                0.47 |