Table 2.
Pearson product-moment correlation coefficients (r) between all depression items
| PHQ | END | CAV | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
| |||||||||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 1 | 2 | 3 | 4 | 1 | 2 | |
| PHQ-1 | - | ||||||||||||||
| PHQ-2 | .75 | - | |||||||||||||
| PHQ-3 | .49 | .47 | - | ||||||||||||
| PHQ-4 | .55 | .52 | .59 | - | |||||||||||
| PHQ-5 | .51 | .49 | .46 | .62 | - | ||||||||||
| PHQ-6 | .54 | .61 | .33 | .39 | .37 | - | |||||||||
| PHQ-7 | .62 | .60 | .50 | .52 | .49 | .52 | - | ||||||||
| PHQ-8 | .51 | .46 | .41 | .45 | .45 | .43 | .56 | - | |||||||
| PHQ-9 | .39 | .42 | .25 | .24 | .25 | .45 | .40 | .28 | - | ||||||
| END-1 | .66 | .63 | .44 | .49 | .49 | .56 | .61 | .56 | .37 | - | |||||
| END-2 | .58 | .69 | .41 | .41 | .40 | .53 | .58 | .43 | .43 | .60 | - | ||||
| END-3 | .60 | .72 | .38 | .43 | .41 | .59 | .52 | .41 | .51 | .56 | .66 | - | |||
| END-4 | .60 | .64 | .36 | .35 | .36 | .52 | .53 | .45 | .51 | .57 | .63 | .66 | - | ||
| CAV-1 | .27 | .31 | .21 | .26 | .29 | .34 | .31 | .28 | .29 | .34 | .38 | .35 | .41 | - | |
| CAV-2 | .39 | .46 | .24 | .29 | .33 | .50 | .39 | .37 | .39 | .46 | .43 | .46 | .49 | .50 | - |
Note: All items were significantly correlated (p < .001); END refers to the Endicott criteria; CAV refers to the Cavanaugh criteria.