Table 3. Post-hoc effect size and power analyses on the Numerical Rating Scale and Short-Form 36 physical summary and mental summary.

	Effect size (d)	Power
Numerical rating scale
Last 2 weeks vs. no belt	0.43	0.52
Last 2 weeks vs. moderate tension	0.73	0.89
Last 2 weeks vs. maximum tension	0.46	0.57
No belt vs. moderate tension	0.35	0.4
Moderate vs. maximum tension	0.31	0.34
Short-Form 36 health survey
Physical summary pre vs. post	0.66	0.83
Physical summary controls vs. patients pre	3.35	1
Physical summary controls vs. patients post	1.89	1
Mental summary pre vs. post	0.24	0.24
Mental summary controls vs. patients pre	0.14	0.1
Mental summary controls vs. patients post	0.46	0.35