Table 2.

Percentage of agreement and kappa coefficients: EQ-5D-Y

EQ-5D-Y	Comparison	Two categories		Three categories
		Percentage of agreement	PABAK	Percentage of agreement
Mobility	Self-report: first- versus second-stage survey	77.4	0.55	76.9
Looking after myself		95.9	0.95	95.9
Doing usual activities		89.1	0.78	88.8
Having pain or discomfort		69.7	0.39	67.3
Feeling worried, sad, or unhappy		65.1	0.30	62.8
Mobility	Self-report versus proxy-report at first-stage survey	74.9	0.50	74.8
Looking after myself		95.7	0.91	95.7
Doing usual activities		89.1	0.78	89.1
Having pain or discomfort		57.6	0.15	56.1
Feeling worried, sad, or unhappy		56.1	0.12	53.8
Mobility	Proxy-report: first- versus second-stage survey	92.7	0.85	92.4
Looking after myself		98.2	0.96	98.2
Doing usual activities		95.7	0.91	95.7
Having pain or discomfort		79.1	0.58	78.3
Feeling worried, sad, or unhappy		74.2	0.48	73.5

PABAK prevalence and bias-adjusted kappa