Table 1 Overview of participants and response rates per school grade over 23 weeks, including retrospective data
Grades | Number of participants | Percent of total sample (%) | Average response rate (%, SD) |
|---|---|---|---|
4 (10–11 years) | 19 | 16.5 | 62 (21.4) |
5 (11–12 years) | 8 | 7 | 57 (20.6) |
6 (12–13 years) | 1 | 0.9 | 52 (51.1) |
7 (13–14 years) | 10 | 8.7 | 72 (13) |
8 (14–15 years) | 21 | 18 | 49 (14.3) |
9 (15–16 years) | 0 | 0 | 0 |
10 (16–17 years) | 15 | 13 | 40 (15.4) |
12 (17–18 years) | 23 | 20 | 55 (14.5) |
13 (18–19 years) | 18 | 16 | 42 (18.6) |
Total | 115 | 100 | 53 (15.5) |