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Table 5 The internal consistency of the final version of the Visual Analogue Scale for Irritable Bowel Syndrome (VAS-IBS) (Cronbach's alpha) (n = 16).

From: Development and psychometric testing of the Visual Analogue Scale for Irritable Bowel Syndrome (VAS-IBS)

VAS-IBS Alpha-if-item deleted Cronbach's alpha coefficient
Physical symptoms   
   Abdominal Pain 0.83  
   Diarrhoea 0.85  
   Constipation 0.85  
   Bloating and Flatulence 0.83  
   Vomiting and Nausea 0.81  
Mental health   
   Perception of mental well-being 0.81  
Quality of Life   
   Interference with daily life 0.83  
Overall scale   0.85
  1. A minimum coefficient of 0.70 was required