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PGSI variation score between baseline and 6 weeks by intervention group and by severity.
| Intervention group | Mean (SD) | ||
| All | 5≤ PGSI <8 (n=98) | 8≤ PGSI (n=91) | |
| Waiting list (n=65) | -1.32 (3.1) | -0.75 (2.4) | -2.03 (3.7) |
| Feedback email (n=65) | -1.06 (4.1) | -0.74 (2.2) | -1.43 (5.5) |
| Self-help CBT book (n=44) | -1.73 (4.2) | -0.48 (3.3) | -3.1 (4.7) |
| Weekly emailed CBT (n=14) | -1.64 (3.9) | -1.25 (3.6) | -1.8 (4.2) |
