Table 2 Main environmental effects of farm related exposures on allergic symptoms and atopic sensitisation in all PARSIFAL children
ExposuresNumber of exposed/unexposed childrenOutcome
Doctor’s diagnosis of asthma OR (95% CI)†Current symptoms of rhinoconjunctivitis OR (95% CI)†Allergic symptoms* OR (95% CI)†Atopic sensitisation (⩾3.5 kU/l) OR (95% CI)†
Ever regular farm animal contact1852/12520.91 (0.66 to 1.26)0.71 (0.50 to 1.01)0.82 (0.63 to 1.07)0.71 (0.55 to 0.91)
Current‡ regular farm animal contact1513/15910.80 (0.57 to 1.11)0.70 (0.48 to 1.01)0.78 (0.60 to 1.03)0.74 (0.58 to 0.96)
Current regular visits to stable or barn1369/17190.54 (0.37 to 0.79)0.64 (0.42 to 0.97)0.58 (0.43 to 0.79)0.67 (0.51 to 0.89)
Mother’s farm animal contact during pregnancy1280/17300.72 (0.48 to 1.05)0.58 (0.38 to 0.89)0.65 (0.48 to 0.89)0.75 (0.56 to 0.96)
Mother worked regularly in stable or barn during pregnancy1028/20650.51 (0.34 to 0.78)0.56 (0.34 to 0.90)0.54 (0.39 to 0.77)0.62 (0.45 to 0.85)
Ever consumption of farm milk1319/15810.50 (0.35 to 0.70)0.66 (0.45 to 0.97)0.56 (0.42 to 0.74)0.95 (0.74 to 1.22)
  • PARSIFAL, Prevention of Allergy Risk factors for Sensitisation In children related to Farming and Anthroposophic Lifestyle.

  • *Doctor’s diagnosis of asthma and/or current symptoms of rhinoconjunctivitis.

  • †Odds ratios (OR) (with 95% confidence intervals (CI)) estimated from a logistic regression model, adjusting for gender, heredity and study group.

  • ‡ Current refers to exposures that have occurred during the last 12 months (for more detailed information see Methods).