TABLE 4.
Baseline, mid-, and postintervention sample size and descriptive statistics for all self-report variables
| Peer |
SS |
WL |
||||
|---|---|---|---|---|---|---|
| n | Mean ± SD | n | Mean ± SD | n | Mean ± SD | |
| EPSI body dissatisfaction | ||||||
| Baseline | 20 | 23.5 ± 4.3 | 18 | 19.9 ± 6.3 | 21 | 21.2 ± 6.5 |
| Midintervention | 19 | 19.6 ± 6.9 | 13 | 19.4 ± 6.0 | 19 | 21.2 ± 6.2 |
| Postintervention | 18 | 18.2 ± 7.5 | 15 | 20.7 ± 6.1 | 20 | 20.9 ± 6.5 |
| Effect size (vs. peer)a | 0.78 (0.07–1.4) | 0.73 (0.09–1.38) | ||||
| EPSI cognitive restraint | ||||||
| Baseline | 20 | 7.1 ± 2.8 | 18 | 7.3 ± 3.0 | 21 | 7.1 ± 2.4 |
| Midintervention | 19 | 6.2 ± 3.3 | 13 | 6.8 ± 3.0 | 19 | 7.3 ± 2.1 |
| Postintervention | 18 | 5.6 ± 2.3 | 15 | 7.0 ± 2.7 | 20 | 7.4 ± 2.3 |
| Effect size (vs. peer)a | 0.72 (0.01–1.43) | 0.64(0.0–1.30) | ||||
| EPSI restricting | ||||||
| Baseline | 20 | 11.5 ± 7.2 | 18 | 10.8 ± 6.4 | 21 | 8.4 ± 4.6 |
| Midintervention | 19 | 11.7 ± 6.6 | 13 | 10.5 ± 5.9 | 19 | 9.6 ±4.9 |
| Postintervention | 18 | 9.5 ± 6.1 | 15 | 10.2 ± 5.2 | 20 | 9.4 ± 4.9 |
| Effect size (vs. peer)a | 0.30 (−0.41 to 1.01) | 0.45 (−0.20 to 1.10) | ||||
| ED-QOL | ||||||
| Baseline | 20 | 1.62 ± 0.61 | 18 | 1.57 ± 0.54 | 21 | 1.43 ± 0.63 |
| Midintervention | 19 | 1.33 ± 0.76 | 13 | 1.41 ± 0.69 | 19 | 1.50 ± 0.54 |
| Postintervention | 17 | 1.29 ± 0.88 | 15 | 1.41 ± 0.64 | 20 | 1.56 ± 0.64 |
| Effect size (vs. peer)a | 0.04 (−0.67 to 0.75) | 0.52 (−0.14 to 1.18) | ||||
| PHQ-9 (depression) | ||||||
| Baseline | 18 | 13.8 ± 6.5 | 17 | 9.6 ± 5.3 | 21 | 13.1 ± 7.2 |
| Midintervention | 19 | 13.3 ± 7.9 | 12 | 8.3 ± 4.2 | 19 | 13.9 ± 8.0 |
| Postintervention | 18 | 9.9 ± 6.6 | 15 | 11.3 ± 6.8 | 20 | 13.7 ± 9.0 |
| Effect size (vs. peer)a | 0.78 (0.09–1.47) | 0.45 (−0.19 to 1.09) | ||||
| STAI (anxiety) | ||||||
| Baseline | 20 | 61.8 ± 8.2 | 18 | 59.1 ± 7.7 | 21 | 59.0 ± 9.6 |
| Midintervention | 19 | 57.9 ± 12.3 | 13 | 57.2 ± 11.0 | 19 | 62.5 ± 9.1 |
| Postintervention | 17 | 54.9 ± 13.1 | 15 | 59.9 ± 10.4 | 20 | 61.3 ± 9.9 |
| Effect size (vs. peer)a | 0.77 (0.06–1.48) | 0.69 (0.04–1.34) | ||||
Abbreviations: ED-QOL, Eating Disorder Quality of Life; EPSI, Eating Pathology Symptoms Inventory; PHQ-9, Patient Health Questionnaire-9; SS, social support; STAI, State-Trait Anxiety Inventory; WL, waiting list.
a
Effect sizes are calculated as between-group difference in change score divided by SD in change score.