Table 2 Primary and secondary outcomes evaluated, and time points used for analyses
Outcome | Session 1 | Session 2 | Session 3 | Session 4 (follow-up) |
|---|---|---|---|---|
Primary outcomes | ||||
Pain intensity (VAS) at the session beginning | X | X | X | X |
Back disability (QBPDQ) at the session beginning | X | X | X | X |
Secondary outcomes | ||||
Spinal stiffness at T6, T7 and T8 (N/mm) | Before SMT/rest | X | ||
Muscle activity during spinal stiffness at T6, T7 and T8 (nRMS) | During spinal stiffness procedure before SMT/rest | X | ||
Tenderness during spinal stiffness at T6, T7 and T8 (VAS) | During spinal stiffness procedure before SMT/rest | X | ||
Outcome for the exploratory analysis | ||||
Subjective improvement | X | |||