| T1 | T2 | T3 | T4 |
---|
n
| 2,230 | 2,149 | 1,816c
| 1,881d
|
mean age (SD) | 11.09 (0.56) | 13.56 (0.53) | 16.27 (0.73) | 19.1 (0.60) |
% girls | 50.8 | 51 | 52.3 | 52.3 |
response rate (%) | 76a
| 96.4b
| 81.4b
| 84.3b
|
-
a Of the 2,935 eligible children asked to participate at T1.
-
b Of the 2,230 included children at T1.
-
c Non-responders at T3 include 2 deceased, 7 who were physically or psychologically unable to participate, 4 who were detained or moved abroad, and 31 untraceable or unreachable participants. Other non-responders refused participation or did not return any information (n = 372).
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d Non-responders at T4 include 5 deceased, 3 who were physically or psychologically unable to participate, and 1 detained participant, 16 untraceable and 43 unreachable participants, and 9 participants who moved abroad. Other non-responders refused participation or did not return any information (n = 272).