Table 3.

Prediction of daily musculoskeletal well-being, musculoskeletal pain, and surefootedness in multilevel regression analyses

	Musculoskeletal well-being		Pain		Surefootedness
	B	SE	B	SE	B	SE
Constant	8.394	0.668	2.508	0.450	9.535	0.549
Sex	−0.008	0.552	−0.328	0.372	−0.495	0.455
BMI	0.008	0.075	0.021	0.051	−0.045	0.062
Age	0.005	0.018	0.001	0.012	−0.006	0.015
LBP	−0.230	0.160	0.302†	0.110	−0.109	0.128
SR-WBV	0.218*	0.087	−0.063	0.072	0.203‡	0.051
Day	0.016‡	0.004	−0.005	0.003	0.001	0.002
Interaction effects
Day × Training	0.016†	0.006	0.002	0.005	0.013†	0.003
Training × LBP	0.176†	0.074	−0.102	0.061	−0.026	0.043
Day × LBP	0.000	0.003	0.000	0.003	0.001	0.002
Training × Day × LBP	−0.002	0.005	−0.010**	0.004	−0.001	0.003

*p < 0.05.

^†p < 0.01.

^‡p < 0.001, two-tailed.

n = 3,324 daily pain ratings reported by 54 participants during 56 days.

Sex (0 = m, 1 = f), B, fixed parameter estimates of unstandardized regression coefficients; BMI, body mass index; CTSIB, clinical test of sensory integration on balance; Day, day of training period (1-28); LBP, frequency of low back pain during last 6 months prior to the study started; Pain, self-reported musculoskeletal pain on first day of the study; SE, standard error in unstandardized regression coefficients estimation. Significance levels were calculated by t-values (Parameter Estimate/SE) with j-p-1 degrees of freedom, where j is the number of units on level 2 and p is the number of explanatory variables; SR-WBV, Stochastic resonance whole-body vibration training (0 = control group, 1 = training group); surefootedness, self-reported perceived body balance on first day of the study.