Table 4.
Treatment engagement by treatment condition.
| Variable | All participants (N = 434) |
ICBT (n = 108) |
ICBT-extension (n = 103) |
ICBT-booster (n = 110) |
ICBT-extension + booster (n = 113) |
|||||
|---|---|---|---|---|---|---|---|---|---|---|
| n | % | n | % | n | % | n | % | n | % | |
| Completion of 4 lessons | 360 | 82.9 | 86 | 79.6 | 93 | 90.3 | 88 | 80.0 | 93 | 82.3 |
| Completion of 5 lessons | 309 | 71.2 | 72 | 66.7 | 77 | 74.8 | 79 | 71.8 | 81 | 71.7 |
| Completion of post-treatment primary measures | 344 | 79.3 | 79 | 73.1 | 87 | 84.5 | 87 | 79.1 | 91 | 80.5 |
| Completion of 16-week primary measures | 294 | 67.7 | 80 | 74.1 | 72 | 69.9 | 67 | 60.9 | 75 | 66.4 |
| Completion of 26-week primary measures | 293 | 67.5 | 68 | 63.0 | 71 | 68.9 | 72 | 65.5 | 82 | 72.6 |
| Mean days between first and last log-in (SD) | 77.74 (46.93) | – | 63.19 (44.30) | – | 67.69 (35.08) | – | 91.39 (52.93) | – | 86.85 (47.55) | – |
| Mean number of log-ins (SD) | 22.41 (19.76) | – | 21.75 (19.99) | – | 20.41 (12.95) | – | 23.57 (19.42) | – | 25.65 (23.63) | – |
| Mean messages from therapist to patient (SD) | 10.71 (2.66) | – | 9.15 (1.80) | – | 10.94 (2.51) | – | 10.56 (1.97) | – | 12.14 (3.19) | – |
| Mean messages from patient to therapist (SD) | 4.22 (3.85) | – | 3.80 (2.98) | – | 4.56 (4.43) | – | 3.96 (3.87) | – | 4.55 (4.00) | – |
| Mean phone calls with therapist (SD) | 1.50 (1.73) | – | 1.31 (1.52) | – | 1.60 (1.95) | – | 1.44 (1.54) | – | 1.66 (1.88) | – |
| Mean total minutes therapists spent per client | 124 (62) | – | 109 (52) | – | 126 (61) | – | 121 (58) | – | 140 (71) | – |
Note. ICBT = Internet-delivered Cognitive Behaviour Therapy.