Table 3.
Correlations and Validity Estimates for Combined Clinical Rating and Questionnaire Indicators
| Correlations: Full Sample (Taxon/Complement)
|
|||||||
|---|---|---|---|---|---|---|---|
| #1/2 | #3 | #4 | #5 | #6 | #7 | #8 | |
| Symptom #3 | .51 (.31/.29) | ||||||
| Symptom #4 | .51 (.21/.28) | .44 (.33/.25) | |||||
| Symptom #5 | .64 (.41/.47) | .42 (.24/.26) | .45 (.24/.28) | ||||
| Symptom #6 | .72 (.47/.55) | .45 (.25/.28) | .49 (.19/.34) | .58 (.34/.42) | |||
| Symptom #7 | .71 (.41/.57) | .37 (.11/.18) | .38 (.07/.17) | .53 (.19/.41) | .56 (.28/.37) | ||
| Symptom #8 | .63 (.44/.43) | .37 (.15/.21) | .41 (.23/.21) | .56 (.31/.43) | .59 (.35/.44) | .60 (.32/.48) | |
| Symptom #9 | .72 (.52/.63) | .37 (.12/.17) | .36 (.02/.20) | .47 (.20/.32) | .50 (.18/.34) | .63 (.43/.51) | .49 (.25/.32) |
| Validity Estimates
|
||||||||
|---|---|---|---|---|---|---|---|---|
| #1/2 | #3 | #4 | #5 | #6 | #7 | #8 | #9 | |
| Taxon M | 1.22 | 0.76 | 0.80 | 0.85 | 0.97 | 0.95 | 0.86 | 0.95 |
| Taxon SD | 0.68 | 1.23 | 0.95 | 0.94 | 0.81 | 0.92 | 0.88 | 1.24 |
| Complement M | −0.44 | −0.28 | −0.29 | −0.31 | −0.35 | −0.35 | −0.31 | −0.35 |
| Complement SD | 0.68 | 0.73 | 0.85 | 0.83 | 0.82 | 0.78 | 0.85 | 0.60 |
| Validity (d) | 2.45 | 1.17 | 1.25 | 1.34 | 1.62 | 1.58 | 1.38 | 1.58 |
| Skew | 0.65 | 1.60 | 0.71 | 0.53 | 0.40 | 0.72 | 0.42 | 1.65 |
Note: MDD = major depressive disorder. N = 1,500; taxon n = 400 MDD+; complement n = 1,100 MDD−. All indicators have been standardized. Symptom numbers refer to DSM-IV criteria for MDD. Indicator validity is expressed as Cohen’s d, the mean difference between the taxon and complement standardized using pooled within-groups variances (weighted by df).