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Caracteristics of sample 2:
At Time 1, 1,750 families agreed to participate in the study.
The children involved were enrolled in Grade 1 (54%) or Grade 2 (46%). The target child was a boy (62%) or a girl (38%).
Study Follow-Up (T1 to T10)
Since the beginning of the study, 1,634 parents from 1,362 families have completed at least one questionnaire.
The majority of respondents were women (73%).
Among these parents, 51% reported that their child had received a diagnosis (e.g., ADHD, learning disorder).
Parental Participation
|
|
|
No. of potential families*
|
|
No. of participating families**
|
|
No. of parents |
|
% mothers |
|
T1
|
Oct. 2020 |
1,750 |
|
1,067 (61%) |
|
1,205 |
|
76% |
| T2 |
June 2021 |
1,679 |
|
1,033 (62%) |
|
1,189 |
|
76% |
| T3 |
Oct. 2021 |
1,486 |
|
770 (52%) |
|
894 |
|
76% |
| T4 |
June 2022 |
1,424 |
|
665 (47%) |
|
754 |
|
78% |
| T5 |
Oct. 2022 |
1,328 |
|
804 (61%) |
|
932 |
|
77% |
| T6 |
June 2023 |
1,280 |
|
636 (50%) |
|
742 |
|
76% |
| T7 |
Oct. 2023 |
1,250 |
|
641 (51%) |
|
737 |
|
77% |
| T8 |
June 2024 |
1,220 |
|
611 (50%) |
|
721 |
|
77% |
| T9 |
Oct. 2024 |
1,191
|
|
612 (51%) |
|
704 |
|
76% |
| T10 |
June 2025 |
1,156 |
|
645 (56%) |
|
732 |
|
78% |
*Families are contacted at each measurement point. However, some choose to withdraw from the study, while others become unreachable due to outdated contact information. These families are then considered lost to follow-up.
**At least one family member completed a questionnaire.
Starting in Grade 5, children are directly invited to take part in the study.
Thus, students who were in Grade 2 at Time 1 reached Grade 5 by Time 8, representing approximately half of the sample.
Child Participation
|
|
|
No. of potential children*
|
|
No. of participating children
|
|
% boys |
| T8 |
June 2024 |
452 |
|
193 (43%) |
|
61% |
| T10 |
June 2025 |
969 |
|
430 (44%) |
|
60% |
*Maximum number eligible to participate.