Table 1

Logistic regression of covariates predicting the presence of IBS

	All subjects		Subjects aged <40
	β	Significance	β	Significance
Bronchial hyper-responsiveness	−0.50	<0.001	−0.55	<0.005
Bronchitis^1-150	−0.01	>0.9
Gastro-oesophageal reflux symptoms	−0.30	<0.01	−0.35	<0.05
Dyspepsia	−1.55	<0.001	−1.38	<0.001

↵1-150 Bronchitis was not independently associated with IBS at a significant level.