A comparison of EQ-5D index scores using the UK, US, and Japan preference weights in a Thai sample with type 2 diabetes

Table 8 Known-groups validity of the EQ-5D index scores using UK, US, and Japan preference weights

	No.	UK	US	Japan	Relative Precision^a	Relative Precision^b	Relative Precision^c
HbA1c < 7%	110	0.79	0.83	0.77
HbA1c ≤ 7%	193	0.75	0.80	0.73
Difference		0.04	0.03*	0.04*
Z statistic		-1.91	-2.00	-2.59	0.96	1.36	1.30
Neuropathy (No)	179	0.81	0.84	0.79
Neuropathy (Yes)	124	0.69	0.77	0.69
Difference		0.12**	0.07**	0.10**
Z statistic		-5.94	-5.89	-6.33	1.01	1.06	1.07
Retinopathy (No)	252	0.78	0.82	0.76
Retinopathy (Yes)	51	0.69	0.76	0.69
Difference		0.09*	0.06*	0.07**
Z statistic		-2.16	-2.07	-2.68	1.04	1.24	1.29
Nephropathy (No)	278	0.77	0.82	0.75
Nephropathy (Yes)	25	0.67	0.75	0.68
Difference		0.10*	0.07**	0.07**
Z statistic		-2.57	-2.70	-2.75	0.95	1.07	1.02
Cardiovascular (No)	259	0.78	0.83	0.76
Cardiovascular Yes)	44	0.65	0.73	0.66
Difference		0.13**	0.10**	0.10**
Z statistic		-3.48	-3.45	-3.60	1.01	1.03	1.04

Note: Data in the columns of UK, US, and Japan are mean EQ-5D index scores. The differences in the scores between groups were tested by Mann-Whitney U tests.
* p-value < 0.05, **p-value < 0.01
^a Ratio of Z statistics for UK weights & US weights
^b Ratio of Z statistics for Japan weights & UK weights
^c Ratio of Z statistics for Japan weights & US weights

ISSN: 1477-7525