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Table 3 Test-Retest Reliability (ICCs) and Internal Consistency Reliability (Cronbach's alpha)

From: A disease-specific measure of health-related quality of life for use in adults with immune thrombocytopenic purpura: Its development and validation

Scales ICCs (n = 73)* ICCs (n = 69) Cronbach's alpha
Symptoms 0.80 0.83 0.71
Fatigue/Sleep 0.87 0.88 0.89
Bother-Physical Health 0.52 0.56 0.79
Activity 0.66 0.66 0.89
Psychological 0.72 0.75 0.92
Fear 0.83 0.87 0.87
Social Activity 0.70 0.74 0.72
Work 0.87 0.87 0.86
Reproductive Health 0.90 0.89 0.66
Overall QoL 0.77 0.81 0.89
  1. *Entire sample
  2. Sub-sample of respondents who completed the second questionnaire within three weeks