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Dropout rate in the randomization groups at 6 and 12 weeks.
| Intervention group | Dropout on PGSI at 6 weeks, n (%) | Dropout on PGSI at 12 weeks, n (%) |
| Waiting list (n=264) | 199 (75.4)a | 219 (83.0) |
| Feedback email (n=293) | 228 (77.8)a | 252 (86.0) |
| Self-help CBT book (n=264) | 220 (83.3)a | 245 (92.8) (P=.001) |
| Weekly emailed CBT (n=301) | 287 (95.3)a | 293 (97.3)a |
a P value <.001 (chi-square test).
