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| Q | Age (Y) | Yes | N (=100%) |
|---|---|---|---|
| 2 | 9 | 0.5% | 3624 |
| 3 | 10 | 2.2% | 3459 |
| 4 | 11 | 16.2% | 3306 |
| 5 | 12 | 61.9% | 3185 |
| 6 | 14 | 96.1% | 2861 |
| 7 | 15 | 98.2% | 2556 |
| 8 | 16 | 99.4% | 2812 |
| 9 | 17 | 99.7% | 2585 |
Q = questionnaire no.; Y = year of age; N = no. of individuals with data
