Table 1.
Scale response anchors: means, SDs, and between-group statistics on key variables.
| Variable | Scale anchors | Control group (n=135) | Experimental group 1 (n=131) | Experimental group 2 (n=145) | F test (df) | P value | |||||||
|
|
Range | Mean (SD) | na (%) | Mean (SD) | na (%) | Mean (SD) | na (%) |
|
|
||||
| Age (years)b | 18-30 | 23.24 (3.59) | 129 (95.6) | 23.2 (3.67) | 128 (97.7) | 23.68 (3.74) | 134 (92.4) | 0.71 (2, 388) | .494 | ||||
| Conscientiousness | 1-5 | 3.35 (0.66) | 128 (94.8) | 3.25 (0.65) | 128 (97.7) | 3.26 (0.66) | 138 (95.2) | 0.82 (2, 391) | .44 | ||||
| Neuroticism | 1-5 | 3.84 (1.06) | 127 (95.1) | 3.87 (1.02) | 128 (97.7) | 3.84 (1.08) | 138 (95.2) | 0.03 (2, 390) | .97 | ||||
| Depression | 0-42 | 25.22 (9.53) | 133 (98.5) | 26.43 (8.5) | 130 (99.2) | 25.74 (9.40) | 144 (99.3) | 0.58 (2, 404) | .56 | ||||
| Anxiety | 0-42 | 16.72 (8.78) | 133 (98.5) | 17.88 (8.74) | 130 (99.2) | 17.97 (9.87) | 144 (99.3) | 0.78 (2, 404) | .46 | ||||
| Stress | 0-42 | 23.56 (8.30) | 133 (98.5) | 24.97 (8.51) | 130 (99.2) | 24.71 (8.49) | 144 (99.3) | 1.05 (2, 404) | .35 | ||||
| Alcohol consumption | 0-12 | 7.66 (1.99) | 135 (100) | 7.55 (2.16) | 131 (100) | 7.57 (2.05) | 143 (98.6) | 0.11 (2, 406) | .90 | ||||
| Treatment expectation | 0-100 | 46.23 (22.04) | 130 (96.3) | 47.44 (21.77) | 129 (98.5) | 45.07 (22.48) | 138 (95.2) | 0.38 (2, 394) | .68 | ||||
| Self-assessments | 0-12 | 6.51 (4.19) | 135 (100) | 3.75 (3.87) | 131 (100) | 4.43 (4.19) | 145 (100) | 16.59 (2, 408) | <.001 | ||||
| Follow-ups | 0-4 | 2.35 (1.61) | 135 (100) | 1.92 (1.73) | 131 (100) | 2.14 (1.66) | 145 (100) | 2.21 (2, 406) | .11 | ||||
| Treatment satisfactionc | 8-32 | 22.9 (5.72) | 72 (53.3) | 24.56 (4.84) | 57 (43.5) | 24.39 (4.73) | 70 (48.3) | 2.14 (2, 196) | .12 | ||||
| Quality of lifed | 20-99 | 39.51 (9.63) | 73 (54.1) | 40.28 (11.24) | 57 (43.5) | 41.27 (11.67) | 70 (48.3) | 0.48 (2, 197) | .62 | ||||
aResponses to items were optional. Actual numbers ranged from 57 to 145 per group.
bAge, personality, emotional distress, and treatment expectation statistics were computed at registration.
cTreatment satisfaction and quality of life were assessed at trial completion after 64 weeks postbaseline.
dLower scores on the quality-of-life measure indicate higher life quality.