PURPOSE: First, we sought to estimate the magnitude of the cross-sectional associations between overweight/obesity and asthma stratified by gender and by self-reported hay fever and second we sought to assess both directions of causality in longitudinal analyses. METHODS: We used cross-sectional and longitudinal data from a population-based cohort study (n=5114, ages 40-65 at baseline). After 8.5 years, 4010 adults were followed-up by questionnaires. Self-reported height and weight were used to calculate body mass index categories. Multivariate adjusted prevalence ratios (PRs), relative risks (RRs), and 95% confidence intervals (95% CI) were calculated using Poisson regression. RESULTS: In cross-sectional analyses, adjusted PRs were comparable for overweight women and men but differed between obese women and men (PR 1.93, 95% CI 1.19-3.14 and PR 0.98, 95% CI 0.56-1.72). PRs were similar when stratified by hay fever. Longitudinal analyses suggested that overweight/obesity did not increase asthma risk substantially (RR 1.02, 95% CI 0.50-2.06), but a relation between asthma and subsequent weight gain could not be excluded (RR 1.34, 95% CI 1.01-1.77). CONCLUSIONS: The prevalence of asthma is almost twice as high in obese versus normal weight women, but not in obese men. The association between overweight/obesity and asthma does not vary by hay fever. A causal relationship between asthma and incident weight gain cannot be excluded.
PURPOSE: First, we sought to estimate the magnitude of the cross-sectional associations between overweight/obesity and asthma stratified by gender and by self-reported hay fever and second we sought to assess both directions of causality in longitudinal analyses. METHODS: We used cross-sectional and longitudinal data from a population-based cohort study (n=5114, ages 40-65 at baseline). After 8.5 years, 4010 adults were followed-up by questionnaires. Self-reported height and weight were used to calculate body mass index categories. Multivariate adjusted prevalence ratios (PRs), relative risks (RRs), and 95% confidence intervals (95% CI) were calculated using Poisson regression. RESULTS: In cross-sectional analyses, adjusted PRs were comparable for overweight women and men but differed between obesewomen and men (PR 1.93, 95% CI 1.19-3.14 and PR 0.98, 95% CI 0.56-1.72). PRs were similar when stratified by hay fever. Longitudinal analyses suggested that overweight/obesity did not increase asthma risk substantially (RR 1.02, 95% CI 0.50-2.06), but a relation between asthma and subsequent weight gain could not be excluded (RR 1.34, 95% CI 1.01-1.77). CONCLUSIONS: The prevalence of asthma is almost twice as high in obese versus normal weight women, but not in obesemen. The association between overweight/obesity and asthma does not vary by hay fever. A causal relationship between asthma and incident weight gain cannot be excluded.
Authors: Njira L Lugogo; John W Hollingsworth; Druhan L Howell; Loretta G Que; Dave Francisco; Tony D Church; Erin N Potts-Kant; Jennifer L Ingram; Ying Wang; Sin-Ho Jung; Monica Kraft Journal: Am J Respir Crit Care Med Date: 2012-07-05 Impact factor: 21.405
Authors: Meyer Kattan; Rajesh Kumar; Gordon R Bloomberg; Herman E Mitchell; Agustin Calatroni; Peter J Gergen; Carolyn M Kercsmar; Cynthia M Visness; Elizabeth C Matsui; Suzanne F Steinbach; Stanley J Szefler; Christine A Sorkness; Wayne J Morgan; Stephen J Teach; Vanthaya N Gan Journal: J Allergy Clin Immunol Date: 2010-03 Impact factor: 10.793
Authors: Zubair Kabir; Patrick J Manning; Jean Holohan; Patrick G Goodman; Luke Clancy Journal: Int J Environ Res Public Health Date: 2011-08-02 Impact factor: 3.390