Table 1 Study population
Schools | Number invited (aged 12–19 years) | Participants with valid questionnaires (aged 13–18 years) | Participants included with valid questionnaires, interviews and blood pressure data (aged 13–18 years) | ||||
|---|---|---|---|---|---|---|---|
n | Mean age (SD) | % Girls | n | Mean age (SD) | % Girls | ||
Junior high school | 5,004 | 4,508 | 14.6 (0.9) | 50.5 | 3,265 | 14.7 (0.9) | 51.0 |
High school | 4,913 | 3,733 | 17.4 (0.9) | 49.2 | 2,555 | 17.5 (0.9) | 52.9 |
‘Not in school’ | 285 | 14 | 17.2 (0.9) | 64.3 | 12 | 17.2 (0.9) | 75.0 |
Total | 10,202 | 8,255 | 15.9 (1.7) | 49.9 | 5,832 | 5.9 (1.6) | 51.9 |