Exclusion criteria |
| 1) Descriptive only articles 2) Articles without results 3) Interventions without separate findings for attending an after-school programme | 1) Obesity treatment studies 2) Unpublished articles, conference papers, dissertations | 1) Articles without data results 2) Articles with only baseline data 3) Review articles | 1) Descriptive articles only 2) Interventions on diets only 3) Studies involving children suffering from eating disorders or drug or alcohol problems | 1) Conference abstracts 2) Unpublished articles 3) Dissertations 4) Non-English papers |
Quality control | None stated | None stated | Assessed using NICE tool for randomized trials (i.e., 10 internal validity items such as study design and sample size) | None stated | None stated | Adapted version of the Quality Assessment Tool for Quantitative Studies (e.g., selection bias, blinding) |
Studies included (Number) | n = 12 | n = 13 | n = 9 | n = 21 | n = 15 | n = 15 |
Number of studies based on a theory | Not mentioned | n = 5 | n = 6 | n = 8 | n = 2 | n = 8 |
Participant age (years) | 8 - 12 | ≤18 | 5 - 15 | Kindergarten through middle school, average age 9 to 10 years | ≤19 | 5 - 18 |