Table 2.
Questionnaire completion and biological sample collection among 1,462 households participating in the CHILD COVID-19 Add-On Study (n=5,378 children and adults)
| Questionnaires | Baseline |
Follow-up 1 |
Follow-up 2 |
Follow-up 3 |
|---|---|---|---|---|
| Collection period | Jan-Jun, 2021 | Aug-Sep, 2021 | Oct-Dec, 2021 | Jan-Mar, 2022 |
| Completion rate by participant type | ||||
| Child self-report | 1,643/2,064 (79.6) | 987/2,064 (47.8) | 880/2,064 (42.6) | 794/2,064 (38.5) |
| Parent on behalf of child | 2,336/2,766 (84.4) | 1,527/2,766 (55.2) | 1,275/2,766 (46.1) | 1,202/2,766 (43.5) |
| Adult self-report | 2,308/2,576 (89.6) | 1,563/2,576 (60.7) | 1,370/2,576 (53.2) | 1,252/2,576 (48.6) |
| Overall completion rate | 6,287/7,406 (84.9) | 4,077/7,406 (55.0) | 3,525/7,406 (47.6) | 3,248/7,406 (43.9) |
| Biological samples |
Phase A (n=5,326)
|
Phase B (n=3,219)1
|
||
| Collection period | Mar-Sep, 2021 | Oct-Dec, 2021 | ||
| Sample type | Stool | Blood | Stool | Blood |
| Children | 1,445/2,738 (52.8) | 1,462/2,738 (53.4) | 823/1,648 (49.9) | 847/1,648 (51.4) |
| Adults | 1,506/2,588 (58.2) | 1,567/2,588 (60.5) | 969/1,571 (61.7) | 1,022/1,571 (65.0) |
| Total | 2,951/5,326 (55.4) | 3,029/5,326 (56.9) | 1,792/3,219 (55.6) | 1,869/3,219 (58.1) |
Values are presented as number/Number (%).
CHILD, Canadian Healthy Infant Longitudinal Development; COVID-19, coronavirus disease 2019.
1
Households who returned biological samples in phase A were invited to participate in phase B.