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Table 2 Cronbach's alpha at visit 1 and test-retest reliability (Intraclass Correlation Coefficient (ICC))for GSRS and QOLRAD domains between visits 1 and 2.

From: Psychometric validation of the German translation of the Gastrointestinal Symptom Rating Scale (GSRS) and Quality of Life in Reflux and Dyspepsia (QOLRAD) questionnaire in patients with reflux disease

Domains

Cronbach's alpha

ICC

GSRS

  

Reflux

0.70

0.60

Abdominal pain

0.53

0.49

Indigestion

0.86

0.73

Diarrhoea

0.91

0.67

Constipation

0.75

0.72

QOLRAD

  

Emotional distress

0.94

0.84

Food/drink problems

0.91

0.76

Physical/social functioning

0.91

0.84

Sleep disturbance

0.92

0.75

Vitality

0.90

0.70