Methodological quality of articles (n=106)
Inclusion criteria | Design | Attrition | Attrition between groups | Exclusion after | Follow-up period | Occasion of measurement | Same pre–post measurement | Normalisation of DV measurement | Control techniques | Construct definition | Imputing missing data | |||||||||||
Yes | No or N/A* | Pre-experimental | Quasi experimental | Experimental | Yes | No or N/A* | Yes | No or N/A* | Yes | No or N/A* | Yes | No or N/A* | One | Two or more | Yes | No or N/A* | Yes | No or N/A* | Yes | No or N/A* | ||
99 | 1 | 7.7 | 33.7 | 58.7 | 48.1 | 51.9 | 28.9 | 62.9 | 22.1 | 77.9 | 32.7 | 67.3 | 70.2 | 29.8 | 70.2 | 29.8 | 100 | 70.2 | 29.8 | 100 | 19.2 | 80.8 |
*No or N/A=the item is not proceeded or does not appear.