Table 4.

Mean of four times measurements ± standard deviation of moving distance of headrest

	Moving distance d [mm]
Condition	Subject 1	Subject 2	Subject 3	Subject 4	Subject 5	Average
Slide-45	10.3 ± 0.58	7.1 ± 0.37	8.3 ± 0.38	7.6 ± 0.25	9.4 ± 0.31	8.54
Slide-30	12.9 ± 0.80	8.9 ± 0.69	9.1 ± 0.27	7.6 ± 0.18	10.2 ± 0.38	9.74
Slide-10	15.1 ± 0.51	10.9 ± 0.29	9.6 ± 0.35	10.8 ± 0.15	13.0 ± 0.49	11.9