Table 1.
Correlations and Validity Estimates for Clinical Rating Indicators
| Correlations: Full Sample (Taxon/Complement)
|
|||||||
|---|---|---|---|---|---|---|---|
| #1/2 | #3 | #4 | #5 | #6 | #7 | #8 | |
| Symptom #3 | .50 (.23/.21) | ||||||
| Symptom #4 | .55 (.26/.25) | .44 (.28/.22) | |||||
| Symptom #5 | .51 (.28/.24) | .38 (.17/.21) | .46 (.26/.30) | ||||
| Symptom #6 | .63 (.34/.40) | .43 (.22/.21) | .52 (.29/.33) | .49 (.29/.33) | |||
| Symptom #7 | .55 (.20/.28) | .35 (.02/.17) | .41 (.15/.17) | .37 (.06/.22) | .45 (.15/.24) | ||
| Symptom #8 | .61 (.38/.33) | .39 (.11/.20) | .46 (.20/.25) | .48 (.25/.34) | .53 (.21/.37) | .50 (.16/.34) | |
| Symptom #9 | .47 (.26/.19) | .26 (.05/.03) | .30 (.04/.13) | .31 (.13/.09) | .32 (.04/.15) | .38 (.21/.16) | .36 (.17/.14) |
| Validity Estimates
|
||||||||
|---|---|---|---|---|---|---|---|---|
| #1/2 | #3 | #4 | #5 | #6 | #7 | #8 | #9 | |
| Taxon M | 1.28 | 0.83 | 0.88 | 0.79 | 0.93 | 0.89 | 0.91 | 0.77 |
| Taxon SD | 0.63 | 1.24 | 0.93 | 1.16 | 0.78 | 0.94 | 0.92 | 1.46 |
| Complement M | −0.46 | −0.30 | −0.32 | −0.29 | −0.34 | −0.32 | −0.33 | −0.28 |
| Complement SD | 0.64 | 0.68 | 0.82 | 0.75 | 0.85 | 0.80 | 0.81 | 0.54 |
| Validity (d) | 2.73 | 1.31 | 1.41 | 1.23 | 1.54 | 1.45 | 1.47 | 1.19 |
| Skew | 0.67 | 1.44 | 0.61 | 1.18 | 0.32 | 0.59 | 0.54 | 2.40 |
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: #1 = depressed mood; #2 = loss of interest/pleasure in activities; #3 = weight change/appetite disturbance; #4 = sleep disturbance; #5 = psychomotor agitation/retardation; #6 = fatigue/energy loss; #7 = worthlessness/guilt; #8 = concentration difficulties/indecisiveness; #9 = suicidality/thoughts of death. 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).