Table 1. Prevalence of PDs Across Younger and Older Age Groups (expressed as rounded percentages).
| Antisocial | Avoidant | Borderline | Dependlent | Histrionic | Narcissistic | Obsessive- Compulsive |
Paranoid | Schizoid | Schizotypal | |||||||||||
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| Younger | Older | Younger | Older | Younger | Older | Younger | Older | Younger | Older | Younger | Older | Younger | Older | Younger | Older | Younger | Older | Younger | Older | |
| Ames & Molinari6 | 3 | 2 | 1 | 1 | 2 | 1 | 2 | 2 | 3 | 2 | 1 | 0 | 2 | 1 | 1 | 2 | 1 | 2 | 3 | 1 |
| Balsis et al.1 | 4 | 0 | 3 | 1 | NA | NA | 1 | 0 | 2 | 0 | NA | NA | 6 | 2 | 6 | 1 | 4 | 2 | NA | NA |
| Casey & Schrodt7 | 2 | 0 | 0 | 1 | 5 | 0 | 11 | 4 | 3 | 1 | 7 | 1 | 4 | 1 | 1 | 0 | 0 | 0 | 1 | 0 |
| Fogel & Westlake8 | 0 | 0 | NA | NA | NA | NA | 3 | 2 | 2 | 1 | NA | NA | 0 | 5 | NA | NA | NA | NA | NA | NA |
| Kenan et al.9 | 4 | 0 | 1 | 0 | 11 | 0 | 3 | 7 | 3 | 5 | 2 | 7 | 1 | 4 | 1 | 0 | 0 | 0 | 2 | 2 |
| Mezzich et al.10 | 5 | 0 | 1 | 0 | 3 | 0 | 3 | 1 | 2 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 0 |
| Molinari et al.11 | 4 | 3 | 11 | 12 | 22 | 7 | 13 | 9 | 23 | 0 | 4 | 4 | 5 | 12 | 0 | 17 | 0 | 6 | 9 | 6 |
| Narrow et al.12 | 2 | 0 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
NA: not assessed.