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Table 3 Construct validity: correlationsa between selected PRO items among 278 outpatients with chronic kidney disease

From: Patient-reported outcome measures for clinical decision-making in outpatient follow-up: validity and reliability of a renal disease questionnaire

  Daily activities Renal function Feeling aversion to food Quality of life Interpretation of correlation (r) Shape of relationship
Nocturnal awakening r = 0.31
p < 0.0001
    Hypothesis rejected Negative linear
Self-rated health   r = 0.19b
p = 0.004
   Hypothesis accepted Negative linear
Lack of appetite    r = 0.77
p < 0.0001
  Hypothesis accepted Negative linear
Daily activities     r = 0.58
p < 0.0001
Hypothesis accepted Negative linear
  1. aSpearman correlation coefficients (r) were calculated
  2. bn = 233