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Age distribution of the participants in the first examination.
| Group | Age (years) | Total | |||
|---|---|---|---|---|---|
| 6 | 7 | 8 | 9 | ||
| PE | 41 | 44 | 19 | 6 | 110 |
| PM | 3 | 13 | 18 | 16 | 50 |
| NDM | 72 | 86 | 49 | 19 | 226 |
| PH | 4 | 4 | 4 | 0 | 12 |
| Other | 5 | 7 | 4 | 0 | 16 |
| All | 125 | 154 | 94 | 41 | 414 |
PE, persistent emmetropia; PM, persistent myopia; NDM, newly developed myopia; PH, persistent hyperopia; Other, children who developed hypertropia into emmetropia but did not further develop into myopia during the research.
