Table 1. Sample sizes.
| Sports club membership (N) | Habitual PA in sports clubs (N) | |
|---|---|---|
| Grade 1 | 45 (m) / 35 (f) | 33 (m) / 26 (f) |
| Grade 2 | 29 (m) / 55 (f) | 23 (m) / 35 (f) |
| Grade 3 | 53 (m) / 42 (f) | 44 (m) / 30 (f) |
| Grade 4 | 27 (m) / 40 (f) | 18 (m) / 23 (f) |
| Inter-grade or no information about gradea | 23 (m) / 23 (f) | 17 (m) / 17 (f) |
| Average age | 8.8±1.2 (m) / 8.7±1.2 (f) | 8.8 ±1.1 (m) / 8.6±1.1 (f) |
| Total | 372 | 266 |
a These students attended an inter-grade class (different combinations: grades 1 and 3; 2 and 4; 1 and 2; 3 and 4); 3 students (100% male) did not mention their grade in the questionnaire.