Sample Size
The sample size calculation was based on the ability to detect a between-group effect size of 0.3 at 12 months on the RMDQ. Based on a 2-tailed significance level at an α level equal to .05, 80% power, and allowing for a 25% loss to follow-up (not uncommon in military settings with high deployment rates), we aimed to recruit 290 participants, 145 in each group.