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| Characteristic | Sham | 660 | 904 |
| Voluntary = n | 15 | 15 | 15 |
| Age (y), mean (SD) | 22.6 (1.3) | 22.7 (1,5) | 22.9 (1,2) |
| Hand dominance | Right=12; Left= 3 |
Right=12; Left= 2 |
Right = 13; Left = 1 |
| Work status: FT/PT/ NW | NW = 15 |
PT = 1; NW= 14 |
NW= 15 |
| VAS | 0 | 0 | 0 |
Abbreviations: SD, standard deviation; FT; full time; PT, part time; NW, not working; VAS, visual analog scale.
