Table 3

Prevalence of gastrointestinal conditions and use of restrictive diets and their association with health-related quality of life (physical component score and mental component score) among individuals ≥20 years in South Australia in 2015 (n=2912)

Physical component scoreMental component score
YesCrudeAdjusted*CrudeAdjusted*
n%β (95% CI)†β (95% CI)†β (95% CI)†β (95% CI)†
Gastrointestinal condition
   Gastro-oesophageal reflux2458.4 −6.1 (–7.9 to −4.4) −3.7 (–5.2 to −2.2) −2.3 (–3.9 to −0.6) −2.4 (–3.8 to −0.9)
  Irritable bowel syndrome2307.9 −4.7 (–6.5 to −3.0) −3.3 (–4.9 to −1.8) −3.3 (–4.7 to −2.0) −2.9 (–4.2 to −1.6)
  Ulcerative colitis260.9−5.0 (–10.1 to 0.2)−2.7 (–7.1 to 1.7) −6.0 (–9.5 to −2.6) −5.7 (–9.0 to −2.3)
  Crohn’s disease230.8−4.7 (–10.8 to 1.3)−4.4 (–9.4 to 0.6)−2.4 (–7.1 to 2.3)−2.5 (–6.7 to 1.7)
  Coeliac disease200.7−1.7 (–5.8 to 2.5)−1.7 (–5.2 to 1.9)−0.6 (–3.8 to 2.6)−0.5 (–3.4 to 2.5)
  Any‡47816.4 −5.2 (–6.4 to −4.0) −3.4 (–4.5 to −2.4) −2.6 (–3.6 to −1.5) −2.5 (–3.5 to −1.5)
Restrictive diet
  Avoid foods for pain, bloating or diarrhoea67823.3 −2.3 (–3.4 to −1.3) −2.1 (–3.0 to −1.1) −1.6 (–2.6 to −0.7) −1.4 (–2.3 to −0.5)
  Lactose restricted57719.8 −1.3 (–2.3 to −0.3) −1.4 (–2.3 to −0.5) −1.1 (–1.9 to −0.2) −1.0 (–1.8 to −0.1)
  Gluten restricted2689.2−0.7 (–2.0 to 0.7)−1.0 (–2.2 to 0.2) −1.7 (–3.0 to −0.3) −1.3 (–2.6 to 0.1)
  Any§105136.1 −2.1 (–3.0 to −1.2) −1.9 (–2.7 to −1.1) −1.5 (–2.2 to −0.7) −1.3 (–2.0 to −0.5)
  • *Results are adjusted for sex, age, marital status, area of residence, educational level, working status and socioeconomic position.

  • †The β coefficients represent the mean difference in health-related quality of life between those positive for that condition and the negative ones. Numbers in bold represent the associations with statistical difference between the groups (p<0.05).

  • ‡Either with irritable bowel syndrome, coeliac disease, Crohn’s disease, ulcerative colitis and/or gastrointestinal reflux.

  • §Either those restricting milk/dairy products, gluten and/or if they avoid other foods causing pain, bloating and/or diarrhoea.