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. 2011 Apr 6;13(8):668–676. doi: 10.1093/ntr/ntr056

Table 1.

Correlations Among Depressive Symptom Indicators and With Demographic Characteristics

Range Tolc Intercorrelations (r)a,b
1 2 3 4 5 6 7 8 9 10 11
Depressive symptom scales, M(SD)
    1. IDAS—Dysphoria 19.23 (7.71) 10–46 .22 (.92)
    2. IDAS—Lassitude 12.40 (4.25) 6–26 .42 .72 (.79)
    3. IDAS—Insomnia 12.47 (5.52) 6–30 .42 .69 .50 (.87)
    4. IDAS—Suicidality 6.88 (1.88) 6–18 .66 .52 .35 .42 (.77)
    5. IDAS—Appetite loss 5.12 (2.66) 3–15 .53 .54 .42 .54 .34 (.91)
    6. IDAS—Appetite gain 4.94 (2.34) 3–14 .75 .32 .30 .25 .25 −.06 (.79)
    7. IDAS—Ill temper 7.69 (3.22) 5–23 .53 .64 .47 .51 .49 .37 .26 (.86)
    8. IDAS—Well-being 22.88 (7.06) 8–40 .70 −.48 −.30 −.23 −.25 −.26 −.03 −.24 (.91)
    9. IDAS—General depression 40.70 (13.16) 22–84 – .96 .76 .76 .53 .66 .27 .61 −.54 (.93)
    10. BDI-II total score 10.12 (9.92) 0–51 – .82 .61 .59 .47 .48 .26 .51 −.55 .82 (.94)
    11. BDI-II dysphoria symptoms 3.24 (3.75) 0–20 – .80 .58 .55 .44 .47 .22 .51 −.51 .79 .95 (.87)
Demographics Correlations with depressive symptom indicators (r)
    Age, M (SD) 35.96 (13.00) 18–65 – −.16** −.32† −.07 −.04 −.14** .02 −.14* .03 −.19*** −.10 −.14*
    Female, n (%)d 150 (44 %) – – .11* .13* .08 .00 .02 .10 .06 −.03 .10 .08 .05
    Caucasian, n (%)e 289 (86 %) – – .01 .07 −.05 −.06 −.14* −.02 <.01 −.03 −.01 −.02 −.04
Clinical characteristics, n (%)
    Current anxiety disorder 95 (28 %) – – .37† .26† .38† .23† .19*** .20*** .26† −.20*** .38† .36† .36†
    Current drug abuse/dependence 29 (9 %) – – .17** .17** .10 .12* .10 −.02 .16** −.16** .17** .16** .19***
    Current alcohol abuse/dependence 25 (7 %) – – .11 .07 .13* .06 −.002 .04 .14* −.07 .10 .12* .13*
    History of somatic disease 97 (29 %) – – −.01 −.06 −.01 −.01 −.01 −.002 −.0002 −.02 −.03 .04 .05

Note. N = 338. BDI-II = Beck Depression Inventory—Second Edition; IDAS = Inventory of Depression and Anxiety Symptoms.

a

Cronbach's α estimates are reported on the diagonal.

b

All intercorrelations significant p < .0001 except for correlations of IDAS-appetite gain with IDAS-appetite loss (p = .31) and with IDAS-well-being (p = .59).

c

Tolerance estimates indicating the proportion of variance within IDAS subscale that is not explained by the other seven IDAS subscales (except for general depression), which provides an estimate of multicollinearity for the combined models presented in Table 3.

d

Female coded as 1 and male coded as 0.

e

Caucasian coded as 1 and non-Caucasian coded as 0.

*p < .05, **p < .01, ***p < .001, †p < .0001.