Table 1.
Age and gender trends in the prevalence of bullying within 40 countries.
| Number of Countries | |||
|---|---|---|---|
| Behaviour | Bullying | Victimization | Bully-victim |
| BOYS | |||
| Trend observed with increasing age | |||
| Prevalence increased * | 28 | 1 | 4 |
| Prevalence decreased * | 1 | 30 | 11 |
| No trend observed | 11 | 9 | 25 |
| GIRLS | |||
| Trend observed with increasing age | |||
| Prevalence increased * | 19 | 0 | 0 |
| Prevalence decreased * | 1 | 25 | 8 |
| No trend observed | 20 | 14 | 32 |
| BOYS VS. GIRLS** | |||
| Prevalence in boys greater than in girls | |||
| All ages | 40 | 11 | 34 |
| Age 11 years | 30 | 5 | 22 |
| Age 13 years | 35 | 7 | 21 |
| Age 15 years | 36 | 5 | 25 |
*
Chi-square for linear trend in proportions (p < 0.001)
**
Fisher's exact for difference (p < 0.001)
1
Bullying 2 or more times a month