Cronbach’s alphas for psychosocial variables
| Scale | Number of items | α |
|---|---|---|
| SDQ—Internalising score | 10 | 0.75 |
| SDQ—Externalising score | 10 | 0.80 |
| SDQ—Emotional | 5 | 0.72 |
| SDQ—Peer | 5 | 0.62 |
| SDQ—Conduct | 5 | 0.64 |
| SDQ—Hyperactivity-inattention | 5 | 0.74 |
| SDQ—Pro-social | 5 | 0.64 |
| Global self-esteem | 5 | 0.81 |
| Physical self-esteem | 3 | 0.91 |
| Attitude to activity | 3 | 0.81 |