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Table 1 Internal consistency reliability and responsiveness. Studies 1 and 2

From: Internal consistency reliability is a poor predictor of responsiveness

Study Instrument and domain Internal consistency reliability Standardised response mean#
Study 1 CRQ-IA   
     Dyspnea individualised 0.78 1.16
     Dyspnea standardised 0.82 0.81
     Fatigue 0.86 0.85
     Emotional function 0.88 0.76
     Mastery 0.75 0.95
  SGRQ   
     Symptoms 0.63 0.27
     Activities 0.75 0.49
     Impact 0.73 0.69
     Total 0.84 0.66
  SF-36   
     Physical Functioning 0.80 0.83
     Role Physical 0.77 0.54
     Bodily Pain 0.93 0.29
     General Health 0.64 0.13
     Vitality 0.80 0.65
     Social Functioning 0.74 0.63
     Role Emotional 0.84 0.50
     Mental Health 0.84 0.41
Study 2 CRQ-IA   
     Dyspnea individualised 0.77 0.66
     Dyspnea standardised 0.86 0.50
     Fatigue 0.80 0.25
     Emotional function 0.90 0.24
     Mastery 0.92 0.38
  CRQ-SA   
     Dyspnea individualised 0.83 0.84
     Dyspnea standardised 0.86 0.69
     Fatigue 0.84 0.60
     Emotional function 0.89 0.56
     Mastery 0.87 0.70
  SGRQ   
     Symptoms 0.72 0.34
     Activities 0.81 0.33
     Impact 0.80 0.46
     Total 0.88 0.51
  SF-36   
     Physical Functioning 0.87 0.31
     Role Physical 0.91 0.19
     Bodily Pain 0.83 0.22
     General Health 0.76 0.22
     Vitality 0.86 0.32
     Social Functioning 0.90 0.21
     Role Emotional 0.92 0.07
     Mental Health 0.87 0.15
  1. ¶Cronbach's alpha; # Change score (follow-up minus baseline) / standard deviation of change score; * Pearson correlation coefficient; CRQ-IA interviewer-administered CRQ; CRQ-SA self-administered CRQ