Reliability of Three Disability Scales for Detection of Independence Loss in Parkinson’s Disease

Table 3

Concordance (kappa values) between independence assessment tools at different cut-off values.

	Established cut-offs		Optimal cut-offs
	HY > 3.0; N = 14	SE < 80; N = 40	HY > 2.0; N = 67	SE < 90; N = 80	BI < 20; N = 61
HY stage > 3.0	—	0.45	0.23	0.17	0.27
SE score < 80	0.45	—	0.52	0.50	0.56
HY stage > 2.0	0.23	0.52	—	0.48	0.40
SE score < 90	0.17	0.50	0.48	—	0.46
BI score < 20	0.27	0.56	0.40	0.46	—

Kappa values exceeding 0.00 represent slight, 0.20 fair, 0.40 moderate, and 0.60 substantial strength of agreement between tests.
HY: Hoehn and Yahr stage; SE: Schwab and England ADL scale score; BI: Barthel ADL index.