Skip to main content

Advertisement

Table 4 The score range, mean as well as floor and ceiling effects and skewness of each item in the final version of the Visual Analogue Scale for Irritable Bowel Syndrome (VAS-IBS), as scored by the participating women (n = 71).

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

VAS-IBS Score Range* Mean (SD) Floor effects % Ceiling effects % Skewness
Physical symptoms      
   Abdominal Pain 0–100 46.5 (29.4) 4.2 7.0 0.444
   Diarrhoea 0–100 60.0 (34.3) 7.1 20.0 -0.283
   Constipation 0–100 58.8 (32.9) 2.8 12.7 -0.226
   Bloating and Flatulence 0–100 33.3 (27.1) 8.5 1.4 0.774
   Vomiting and Nausea 0–100 66.1 (33.8) 4.2 25.4 -0.543
Mental health      
   Perception of mental well-being 0–100 53.2 (30.0) 5.5 5.6 -0.044
Quality of Life      
   Influence daily life ** 0–80 43.6 (29.2) 18.8 0 -0.297
  1. The limit of the floor and ceiling effect was set at 20% or less and the skewness should be between -1 and +1 to be acceptable. 0 = worst symptom/health and 100 = best symptom/health
  2. ** n = 16