Related Experiment Videos
Asthma as a link between chest illness in childhood and chronic cough and phlegm in young adults
D P Strachan1, H R Anderson, J M Bland
1Department of Community Medicine, Medical School, University of Edinburgh.
Insights
Childhood chest illnesses like asthma and pneumonia may increase adult cough and phlegm. However, this link is primarily due to persistent asthma-related functional issues, not lasting lung damage.
Area of Science:
- Pediatric Respiratory Medicine
- Epidemiology
- Longitudinal Cohort Studies
Background:
- Childhood respiratory illnesses are common.
- The long-term impact of early-life chest conditions on adult respiratory health remains an area of investigation.
- Understanding these links can inform public health strategies and clinical interventions.
Purpose of the Study:
- To investigate the association between childhood chest illnesses (up to age 7) and the prevalence of cough and phlegm at age 23.
- To determine if specific childhood respiratory conditions, such as pneumonia and asthma, predict later-life respiratory symptoms.
- To explore the underlying mechanisms, differentiating between functional disturbances and structural lung damage.
Main Methods:
- Utilized data from the National Child Development Study, a large cohort of 10,557 British children born in 1958.
- Analyzed the relationship between reported chest illnesses (pneumonia, asthma, wheezy bronchitis) before age 7 and respiratory symptoms (cough, phlegm) at age 23.
- Employed statistical models to control for confounding factors including current smoking, previous smoking history, recent wheezing, and passive smoke exposure.
Main Results:
- Childhood pneumonia and asthma/wheezy bronchitis were associated with a higher prevalence of chronic cough and phlegm at age 23, even after adjusting for current smoking.
- This association was largely explained by the link between adult respiratory symptoms and a history of asthma or wheezy bronchitis from age 16.
- When analyzed individually, asthma, wheezy bronchitis, and pneumonia up to age 7 did not significantly increase the prevalence of cough or phlegm independently.
Conclusions:
- The persistence of respiratory symptoms like cough and phlegm into adulthood may be more closely related to the ongoing functional disturbances associated with asthma than to permanent structural lung damage from childhood chest illnesses.
- Early-life respiratory conditions, particularly asthma, warrant continued monitoring and management to mitigate long-term respiratory health consequences.
- Further research into the temporal dynamics of asthma-related functional impairments is needed to fully elucidate the continuity of respiratory symptoms from childhood to adulthood.
Abstract:
The link between chest illnesses in childhood to age 7 and the prevalence of cough and phlegm in the winter reported at age 23 was investigated in a cohort of 10,557 British children born in one week in 1958 (national child development study). Both pneumonia and asthma or wheezy bronchitis to age 7 were associated with a significant excess in the prevalence of chronic cough and phlegm at age 23 after controlling for current smoking. This excess was largely attributable to the association of cough and phlegm at age 23 with a history of asthma or wheezy bronchitis from age 16. When adjustment was made for recent wheezing, current cigarette consumption, previous smoking habit, and passive exposure to smoke the relative odds of cough or phlegm, or both, in subjects with a history of childhood chest illness was 1.11 (95% confidence interval 0.97 to 1.27). When analysed separately asthma, wheezy bronchitis, and pneumonia up to age 7 did not significantly increase the prevalence of either cough or phlegm. The explanation for the observed continuity between chest illness in childhood and respiratory symptoms in later life may lie more in the time course of functional disturbances related to asthma than in the persistence of structural lung damage.