Fig. 1

a–d Levels of pain on visual analogue scale (0–100 mm) (a); Morning stiffness (minutes) (b); Child health assessment questionnaire, CHAQ (0–3) (c); Concentration of butyrate (mg/g) in faecal samples (d). All at inclusion and after two and four weeks of specific carbohydrate diet. *Wilcoxon matched-pair signed rank analysis comparing levels at inclusion with levels after four weeks of specific carbohydrate diet