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Table 3 Factor loadings and item-test correlations for the cancer patients

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

Item   F1 F2 r it alpha (del)
1 Loss of interest .54 .47 .60 .82
2 Feeling depressed .49 .66 .68 .82
3 Sleep problems .75 .03 .51 .84
4 Loss of energy .78 .27 .70 .81
5 Appetite problems .58 .27 .52 .83
6 Self-blame .33 .65 .54 .83
7 Concentration problems .65 .32 .61 .82
8 Agitation/retardation .63 .21 .52 .83
9 Suicidal ideation .03 .85 .43 .84
  1. F1, F2 factors of the principal component analysis, r it part-whole corrected item-test correlation, alpha (del) cronbach’s alpha if item deleted; bold: coefficients ≥ .60