Table 4

 Physical exercise and risk of symptomatic gastro-oesophageal reflux

NumberUnivariateMultivariate*
CasesControlsOR95% CIOR95% CI
*In the multivariate logistic regression model adjustments were made for age, sex, body mass index, tobacco smoking, coffee use, table salt intake, and dietary fibre in bread. Alcohol use, tea drinking, and asthma medication were tested, but omitted from the final model since they did not contribute significantly to the explained variance.
†Data on physical exercise represent exposure previous to reflux outcome assessment.
OR, odds ratio; CI confidence interval.
    Physical exercise† of >30 minutes duration
        Never27522311.0(reference)1.0(reference)
        <1/week11610200.9(0.7–1.2)1.0(0.8–1.2)
        1/week23339700.5(0.4–0.6)0.5(0.4–0.7)
        1–3/week22637750.5(0.4–0.6)0.6(0.5–0.7)
        >3/week11614320.7(0.5–0.8)0.7(0.6–0.9)
    p Value for linear trend<0.0001