Abstract
Background: Previous studies have reached conflicting conclusions about the role of atopy as a risk factor for COPD. In part, this is attributable to variation in the definitions of airflow limitation and the treatment of people with asthma.
Objective: To establish whether there is any independent association between atopy and post-bronchodilator airflow limitation in the general population aged 40 years and over.
Methods: A cross-sectional survey was conducted in a general population sample of 2415 people aged 40 years and over in Australia. A history of ever being diagnosed with asthma was elicited by questionnaire. Atopy was defined as any skin prick test weal to common aeroallergens ≥4 mm. Airflow limitation was defined as post-bronchodilator spirometric (FEV1/FVC) ratio < lower limit of normal. Analyses were adjusted for potential confounding due to age, sex, smoking, race and socio-economic status.
Results: The prevalence of atopy, ever diagnosed asthma and post-bronchodilator airflow obstruction was 44.8%, 19.3% and 7.5%, respectively. In the population as a whole, atopy was associated with lower FEV₁ (adjusted difference −0.068L, 95% confidence interval (CI) −0.104 to −0.032), FVC (adj. difference −0.043L, 95% CI −0.086 to −0.0009) and post-bronchodilator FEV₁/FVC ratio (adj. difference −0.011, 95% CI −0.017 to −0.0055). The effect of atopy on lung function was no longer apparent when participants who reported ever diagnosed asthma were excluded (FEV₁ −0.011L, [95% CI −0.05 to 0.028L], FVC −0.012L [95% CI −0.060 to 0.036] and FEV₁/FVC ratio −0.0012 [95% CI −0.0072 to 0.0047L]).
Conclusion and Clinical Relevance: The apparent association between atopy and post-bronchodilator airflow limitation in the general population appears to be explained by the association between atopy and having ever diagnosed asthma and the effect of asthma on lung function.
Objective: To establish whether there is any independent association between atopy and post-bronchodilator airflow limitation in the general population aged 40 years and over.
Methods: A cross-sectional survey was conducted in a general population sample of 2415 people aged 40 years and over in Australia. A history of ever being diagnosed with asthma was elicited by questionnaire. Atopy was defined as any skin prick test weal to common aeroallergens ≥4 mm. Airflow limitation was defined as post-bronchodilator spirometric (FEV1/FVC) ratio < lower limit of normal. Analyses were adjusted for potential confounding due to age, sex, smoking, race and socio-economic status.
Results: The prevalence of atopy, ever diagnosed asthma and post-bronchodilator airflow obstruction was 44.8%, 19.3% and 7.5%, respectively. In the population as a whole, atopy was associated with lower FEV₁ (adjusted difference −0.068L, 95% confidence interval (CI) −0.104 to −0.032), FVC (adj. difference −0.043L, 95% CI −0.086 to −0.0009) and post-bronchodilator FEV₁/FVC ratio (adj. difference −0.011, 95% CI −0.017 to −0.0055). The effect of atopy on lung function was no longer apparent when participants who reported ever diagnosed asthma were excluded (FEV₁ −0.011L, [95% CI −0.05 to 0.028L], FVC −0.012L [95% CI −0.060 to 0.036] and FEV₁/FVC ratio −0.0012 [95% CI −0.0072 to 0.0047L]).
Conclusion and Clinical Relevance: The apparent association between atopy and post-bronchodilator airflow limitation in the general population appears to be explained by the association between atopy and having ever diagnosed asthma and the effect of asthma on lung function.
| Original language | English |
|---|---|
| Pages (from-to) | 1625-1630 |
| Number of pages | 6 |
| Journal | Clinical and Experimental Allergy |
| Volume | 47 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2 Dec 2017 |
| Externally published | Yes |
Keywords
- airflow limitation
- allergic sensitization
- asthma
- atopy
- COPD
- epidemiology
- population health