| Assumptions for outcome measures | |||
---|---|---|---|---|
Stiffness (N) | Multifidus activation (mm) | Oswestry | Numeric Pain Rating | |
Assumption | ||||
 Mean (SD) | 5.55 (1.60) | 2.60 (0.124) | 24.3 (14.9) | 5.06 (2.12) |
 Pre-post score correlation | 0.80 | 0.70 | 0.70 | 0.45 |
 MCID or hypothesized effect size from prior work | 0.40 | 0.074 | 6.0 | 2.0 |
Type of effect | Detectable effect size | |||
 Main effect | 0.37 | 0.034 | 4.12 | 0.76 |
 Pairwise interaction | 0.74 | 0.068 | 8.24 | 1.53 |
 Conditional comparison | 0.53 | 0.048 | 5.83 | 1.08 |
 Main effect in 50% of participants | 0.53 | 0.045 | 5.83 | 1.08 |
 Interaction in 50% of participants | 1.05 | 0.091 | 11.65 | 2.16 |