Table 2.

Mean, Standard Deviation and Average Slope Values for Modified Head-Shake Conditions by Age

	Condition						Slope
Age Group (years)	SOT 2	HS 2- 60	HS 2- 120	SOT 5	HS 5- 15	HS 5- 60
20-39
M	91.63	91.77	91.00	73.10	68.87	69.40	−5.6507
SD	2.76	4.61	4.79	6.40	13.34	11.50	3.05
40-59
M	91.47	91.07	89.83	68.50	67.53	65.77	−6.2983
SD	3.54	3.17	2.32	5.25	5.91	4.90	1.28
60-69
M	89.27	89.63	87.30	66.17	64.43	62.23	−6.6257
SD	2.92	4.12	5.45	11.42	10.9	12.04	2.64
70-79
M	90.67	90.87	89.60	61.70	54.90	54.50	−9.051
SD	2.48	2.94	2.59	10.35	9.00	8.69	1.87

Note. The slope for each individual subject was estimated across the 6 conditions in order of difficulty; individual subject slopes were then averaged for subjects within each age group.