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Table 6 Correlation coefficients of the 11 FQ items versus the 9 PHQ-9 items correlations with the FQ and PHQ-9 sum scores (N = 2,037)

From: Norwegian reference data on the Fatigue Questionnaire and the Patient Health Questionnaire-9 and their interrelationship

  FQ1 FQ2 FQ3 FQ4 FQ5 FQ6 FQ8 FQ9 FQ10 FQ11 FQ
PHQ1 0.42 0.40 0.37 0.44 0.49 0.25 0.35 0.13 0.24 0.30 0.48
PHQ2 0.38 0.38 0.34 0.37 0.46 0.21 0.32 0.09 0.19 0.30 0.43
PHQ3 0.33 0.34 0.30 0.30 0.38 0.27 0.24 0.09 0.19 0.20 0.40
PHQ4 0.52 0.54 0.52 0.45 0.61 0.33 0.34 0.09 0.21 0.30 0.59
PHQ5 0.30 0.35 0.30 0.33 0.38 0.23 0.27 0.10 0.17 0.24 0.38
PHQ6 0.33 0.32 0.32 0.34 0.20 0.42 0.25 0.11 0.20 0.28 0.40
PHQ7 0.27 0.31 0.29 0.29 0.34 0.20 0.40 0.14 0.28 0.37 0.37
PHQ8 0.22 0.23 0.22 0.25 0.25 0.15 0.20 0.14 0.15 0.20 0.30
PHQ-9 0.21 0.23 0.22 0.25 0.25 0.15 0.20 0.14 0.15 0.20 0.27
PHQ 0.50 0.52 0.48 0.51 0.61 0.35 0.46 0.19 0.30 0.37 0.59
  1. Bold numbers showing correlations with Spearman’s coefficients r ≥ 0.50
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Annals of General Psychiatry

ISSN: 1744-859X