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

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

  No. UK US Japan Relative Precisiona Relative Precisionb Relative Precisionc
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
  1. 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.
  2. * p-value < 0.05, **p-value < 0.01
  3. a Ratio of Z statistics for UK weights & US weights
  4. b Ratio of Z statistics for Japan weights & UK weights
  5. c Ratio of Z statistics for Japan weights & US weights