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The development of lung function in Sydney children: effects of respiratory illness and smoking. A ten year study
Insights
Early childhood respiratory illness and teenage smoking significantly impair lung function in children. Asthma and subsequent bronchitis exacerbate these effects, leading to lasting deficits into adulthood.
Area of Science:
- Pediatric Pulmonology
- Environmental Health
- Epidemiology
Background:
- Childhood respiratory illnesses like asthma and bronchitis are common.
- Adolescent smoking is a growing public health concern.
- Long-term effects of early illness and smoking on lung development are not fully understood.
Purpose of the Study:
- To assess the impact of early respiratory illness and adolescent smoking on lung function in schoolchildren.
- To identify specific risk factors contributing to lung function deficits.
- To track changes in lung function over a decade.
Main Methods:
- Longitudinal study of 11,497 Sydney schoolchildren over ten years.
- Regular measurement of lung function, including maximal expiratory flow at 50% of forced vital capacity (V50).
- Documentation of respiratory illness history (infancy/childhood) and smoking habits (teenage years).
Main Results:
- Early bronchitis/asthma (before age 2) led to persistent lung function deficits in both sexes.
- Subsequent bronchitis worsened lung function in children with prior respiratory illness.
- Subsequent asthma had the most significant negative impact, increasing with age.
- Smoking caused lung function deficits by age 14, even in children with initially normal lungs.
- Smoking in children with asthma history resulted in severe lung function abnormalities.
Conclusions:
- Early-life respiratory conditions significantly impact long-term lung function.
- Adolescent smoking further compromises lung health, particularly in vulnerable children.
- Interventions targeting early respiratory illness and adolescent smoking are crucial for preserving lung health.
Abstract:
The lung function of 11,497 Sydney schoolchildren was measured at regular intervals over a ten year period. The prevalences of respiratory illness in infancy and childhood and cigarette smoking in teenage years were documented and the effects on lung function assessed. Using maximal expiratory flow at 50% of forced vital capacity (V 50), small but persisting changes in lung function were found in both males and females who had had bronchitis and/or asthma before the age of 2 years. Subsequent bronchitis had an additional effect on lung function in these children with early respiratory illness. Subsequent asthma had the greatest effect on lung function and the deficit increased as these children approached adult life. Deficits in lung function attributable to smoking were found in some children by the age of 14 years and occurred in children with previously normal lung function. Smoking in children who had a history of asthma was associated with severe abnormalities of lung function.