Power Analysis
PTSD
A power analysis was calculated using PASS power software version 11.0 (NCSS Statistical Software) to test the hypothesis that the IOP-PE would be superior to massed-PE on PTSD outcomes. The primary hypotheses were tests of change-score differences on PTSD symptom severity as measured by the CAPS-5 and PCL-5 at 2 time points (baseline to 1-month follow-up and 1-month follow-up to 6-month follow-up). An estimated statistical power of 80% was determined assuming standardized mean slope difference (Cohen 