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Table 2 Ability of instruments to discriminate between levels of depression severity

From: A comparison of four different approaches to measuring health utility in depressed patients

Depression severity groups Utility score means by depression severity group mean (SD) Mean difference in health utility score Tukey-Kramer test statistic (critical value = 3.649)^
EQ-5D-3L:     
Not depressed vs Mild depression 0.797 (0.226) 0.670 (0.243) 0.128 4.242*
Mild depression vs Moderate depression 0.670 (0.243) 0.557 (0.295) 0.112 3.272
Moderate depression vs Severe depression 0.557 (0.295) 0.268 (0.352) 0.289 9.641*
EQ-5D VAS:     
Not depressed vs Mild depression 0.713 (0.239) 0.586 (0.229) 0.127 5.247*
Mild depression vs Moderate depression 0.586 (0.229) 0.561 (0.209) 0.025 0.901
Moderate depression vs Severe depression 0.561 (0.209) 0.422 (0.211) 0.139 5.693*
SF-6D:     
Not depressed vs Mild depression 0.725 (0.137) 0.624 (0.119) 0.102 7.843*
Mild depression vs Moderate depression 0.624 (0.119) 0.554 (0.096) 0.070 4.733*
Moderate depression vs Severe depression 0.554 (0.096) 0.482 (0.107) 0.072 5.505*
SF-12 new algorithm:     
Not depressed vs Mild depression 0.732 (0.139) 0.617 (0.096) 0.116 9.796*
Mild depression vs Moderate depression 0.617 (0.096) 0.564 (0.073) 0.053 3.927*
Moderate depression vs Severe depression 0.564 (0.073) 0.505 (0.083) 0.059 4.947*
  1. ^The critical values for each comparison were the same at three decimal places.
  2. * Indicates a test statistic greater than the critical value from the Studentized range distribution at the 5% alpha level.