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General characteristics of participants.
| 1st Year (2018) 4th Grade/11 Years Old | 2nd Year (2019) 5th Grade/12 Years Old | 3rd Year (2020) 6th Grade/13 Years Old | |||
|---|---|---|---|---|---|
| The Number of Participants (A) | Remaining Number of Participants | Maintaining Rate about Original Sample | Remaining Number of Participants | Maintaining Rate about Original Sample | |
| total | 2607 | 2437 | 93.5 | 2411 | 92.5 |
| male | 1313 | 1221 | 92.9 | 1211 | 92.2 |
| female | 1294 | 1216 | 93.9 | 1200 | 92.7 |
