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Table 5 Correlations between item scores of the PHQ-9 and scale scores of other instruments in the cancer patients’ sample

From: Assessment of depression severity with the PHQ-9 in cancer patients and in the general population

Item   EORTC EORTC GAD FoP EORTC EORTC EORTC
Emot. Funct. Cognit. Funct. Anxiety Fear of Progression Quality of Life Physical Funct. Fatigue
1 Loss of interest -.51 -.37 .45 .43 -.53 -.43 .49
2 Feeling depressed -.62 -.39 .60 .54 -.51 -.40 .49
3 Sleep problems -.44 -.33 .40 .41 -.38 -.34 .46
4 Loss of energy -.61 -.48 .52 .52 -.58 -.51 .70
5 Appetite problems -.42 -.32 .39 .37 -.39 -.34 .43
6 Self-blame -.49 -.36 .49 .40 -.32 -.22 .34
7 Concentration problems -.53 -.72 .48 .44 -.42 -.36 .49
8 Agitation/retardation -.46 -.48 .47 .36 -.35 -.35 .42
9 Suicidal ideation -.37 -.30 .47 .32 -.29 -.24 .27
  Sum score -.74 -.62 .70 .63 -.63 -.54 .69
  1. Bold coefficients > 0.50. All coefficients are statistically significant with p < 0.001