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Age Trends for Physical Aggression by Site and Sex
| Site | Maximum age (in years) | Total no. of groups | % in chronic group Boys | No. of declining groups | No. of stable groups | No. of increasing groups |
|---|---|---|---|---|---|---|
| Boys | ||||||
| Montreal | 15 | 4 | 4 | 4 | ||
| Quebec | 12 | 4 | 7 | 2 | 2 | |
| Christchurch | 13 | 3 | 11 | 3 | ||
| Dunedin | 13 | 3 | 9 | 3 | ||
| Pittsburgh | 10.5 | 4 | 10 | 2 | 2 | |
| CDP | 12 | 3 | 7 | 3 | ||
| | ||||||
| Girls | ||||||
| Quebec | 12 | 4 | 3 | 1 | 3 | |
| Christchurch | 13 | 3 | 10 | 3 | ||
| Dunedin | 13 | 2 | 0 | 1 | 1 | |
| CDP | 12 | 3 | 10 | 3 | ||
Note. CDP = Child Development Project (U.S.).
