Table 3.

Spearman’s rank correlation coefficients of EQ-5 domains, EQ-VAS, EQ-5D index and derived disability weights

	Mobility	Self-care	Usual activities,	Pain and discomfort	Anxiety and depression	EQ-VAS	EQ-5D index	EQ-VAS derived disability weights	EQ-5D Index derived disability weights
Mobility	1
Self-care	0.3916*	1
Usual activities,	0.5849*	0.4725*	1
Pain/discomfort	0.4721*	0.3898*	0.4550*	1
Anxiety/depression	0.3364*	0.3429*	0.2253	0.3151*	1
EQ-VAS	− 0.6308*	− 0.4928*	− 0.6051*	− 0.4300*	− 0.4162*	1
EQ-5D index	− 0.7553*	− 0.7494*	− 0.7160*	− 0.6270*	− 0.5922*	0.7288*	1
EQ-VAS disability weight	0.6308*	0.4928*	0.6051*	0.4300*	0.4162*	− 1	− 0.7288*	1
EQ-5D disability weight	0.7553*	0.7494*	0.7160*	0.6270*	0.5922*	− 0.7288*	− 1	0.7288*	1

# Correlation coefficient	Interpretation of effect size
.90 to 1.00	Nearly, practically, or almost: perfect, distinct, infinite
.70 to .90	Very large, very high, huge
.50 to .70	Large, high, major
.30 to .50	Moderate, medium
.10 to .30	Small, low, minor
.00 to .10	Trivial, very small, insubstantial, tiny, practically zero

^*Significance level p < 0.05