Table 2 Linear mixed effects model summary for force standard deviation (variability)

Fixed effects

Estimate (SE)

df

t

Partial R²

Log SD

Intercept

.698 (.0744)

65.4

9.383***

Level 1

 Gain_{Low vs. Med & High}

.114 (.0439)

301.9

2.595**

.006

 Gain_{Low & Med vs. High}

.169 (.0443)

301.9

3.826***

.012

 Vibration

.123 (.0380)

304.5

3.247**

.009

Level 2

 Group

.145 (.1498)

65.6

.966

.011

 Age

− .023 (.0715)

65.5

−.328

.001

 Sex

−.398 (.1532)

65.8

−2.599*

.076

Interactions

 Group × Vibration

−.157 (.0760)

304.6

−2.062*

.004

 Group × Age

−.573 (.1413)

65.6

−4.054***

.168

Random effects

Variance (SD)

Participant (intercept)

.282 (.5313)

 Residual

.119 (.3443)