Table 1.
Cases used in this study.
| Questionnaire type | Survey design | Mode group | |||||||||||
| Single-mode design | Sequential mixed-mode design | Concurrent mixed-mode design | Preselect mixed-mode design | ||||||||||
| SAQ-papera | SAQ-paper | SAQ-Webb | Total | SAQ-paper | SAQ-Web | Total | SAQ-paper | SAQ-Web | Total | SAQ-paper | SAQ-Web | Total | |
| Parent-completed health questionnaires | 970 | 488 | 366 | 854 | 837 | 109 | 946 | 465 | 233 | 698 | 2760 | 708 | 3468 |
| Adolescent-completed health questionnaires | 343 | 117 | 152 | 269 | 244 | 46 | 290 | 191 | 101 | 292 | 895 | 299 | 1194 |
aSAQ-paper: self-administered paper-based questionnaire.
bSAQ-Web: self-administered Web-based questionnaire.