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Table 4 Correlations to assess the convergent and divergent validity of the FACIT-Fatigue scales versus other measures

From: Content validity and psychometric evaluation of the Functional Assessment of Chronic Illness Therapy-Fatigue scale in patients with chronic lymphocytic leukemia

  Spearman’s r
FACIT-Fatigue vs: Symptom subscale Impact subscale Global Fatigue scale
EORTC QLQ-C30
 Global health status 0.66 0.64 0.69
 Physical functioning 0.61 0.71 0.71
 Role functioning 0.56 0.67 0.66
 Emotional functioning 0.49 0.54 0.55
 Cognitive functioning 0.37 0.52 0.48
 Social functioning 0.47 0.57 0.55
 Fatigue −0.75 −0.75 −0.80
 Nausea/vomiting −0.33 −0.33 −0.35
 Pain −0.39 −0.43 −0.44
 Dyspnea −0.34 −0.32 −0.35
 Insomnia −0.28 −0.26 −0.28
 Appetite loss −0.39 −0.42 −0.44
 Constipation −0.13 −0.20 −0.18
 Diarrhea −0.18 −0.16 −0.17
 Financial problems −0.21 −0.31 −0.29
EQ-5D-5L
 Mobility −0.40 −0.45 −0.46
 Self-care −0.19 −0.32 −0.29
 Usual activities −0.48 −0.61 −0.59
 Pain/discomfort −0.39 −0.38 −0.41
 Anxiety/depression −0.44 −0.47 −0.49
EQ-VAS score 0.61 0.60 0.64
  1. Correlations are assessed based on absolute values. Strong correlations: absolute rs ≥ 0.50; moderate correlation: absolute 0.30 ≤ rs < 0.50; weak correlations: absolute 0.10 ≤ rs < 0.30
  2. Abbreviations: EORTC QLQ-C30 European Organisation for Research and Treatment of Cancer Quality of Life Questionnaire-Core 30-questions, EQ-5D-5L 5-level, 5-dimension EuroQol questionnaire, EQ-VAS EuroQol global health visual analog scale, FACIT-Fatigue Functional Assessment of Chronic Illness Therapy-Fatigue scale, rs Spearman’s r
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