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Table 3 Power calculations

From: Feedback versus no feedback in improving patient outcome in group psychotherapy for eating disorders (F-EAT): protocol for a randomized clinical trial

Outcome Minimal relevant difference (points) SD (points) Risk of type I error Power (N = 128) Power (N = 170)
Eating Disorder Examination (EDE) 0.5 1.33 5% 55.9% 68.3%
Outcome Rating Scale (ORS) 4.5 9.5 5% 75.8% 86.7%
Symptom Check List (SCL-90-R) 0.3 0.67 5% 71.0% 82.8%
WHO-Five Wellbeing Index (WHO-5) 2.5 5.6 5% 70.8% 82.5%
Sheehan Disability Scale (SDS) 3.5 7.1 5% 79.1% 89.2%