Table 6.

Construct Validity: Individual DGI Item Comparison with Impairment Outcome Measures

	ICARS	ICARS P & G	SARA	Item 1	Item 2	Item 3	Item 4	Item 5	Item 6	Item 7
ICARS	1.0	-	-	-	-	-	-	-	-	-
SARA	0.94**	-	1.0	-	-	-	-	-	-	-
Item 1	−0.87**	−0.83**	−0.87**	1.0	-	-	-	-	-	-
Item 2	−0.77**	−0.74**	−0.79**	0.83**	1.0	-	-	-	-	-
Item 3	−0.71**	−0.57**	−0.62**	0.74**	0.70**	1.0	-	-	-	-
Item 4	−0.77**	−0.68**	−0.64**	0.59**	0.63**	0.67**	1.0	-	-	-
Item 5	−0.82**	−0.70**	−0.78**	0.77**	0.72**	0.76**	0.79**	1.0	−	-
Item 6	−0.82**	−0.79**	−0.77**	0.90**	0.83**	0.72**	0.60**	0.66**	1.0	-
Item 7	−0.78**	−0.76**	−0.70**	0.85**	0.84**	0.67**	0.72**	0.69**	0.89**	1.0

Spearman’s rho Inter-rater reliability for the individual test items of the DGI: Dynamic Gait index (n=20); the SARA: Scale for Assessment and Rating of Ataxia (n=19); and the ICARS: International Cooperative of Ataxia Rating Scale (n=20); ICARS P & G: International Cooperative of Ataxia Rating Scale Posture and Gait Subscales (n=20)

^**indicates significance at the 0.01 level (2-tailed).