Lung health and exposure to air pollution in Malawian children (CAPS): a cross-sectional study

Thorax. 2019 Nov;74(11):1070-1077. doi: 10.1136/thoraxjnl-2018-212945. Epub 2019 Aug 29.

Abstract

Background: Non-communicable lung disease and exposure to air pollution are major problems in sub-Saharan Africa. A high burden of chronic respiratory symptoms, spirometric abnormalities and air pollution exposures has been found in Malawian adults; whether the same would be true in children is unknown.

Methods: This cross-sectional study of children aged 6-8 years, in rural Malawi, included households from communities participating in the Cooking and Pneumonia Study (CAPS), a trial of cleaner-burning biomass-fuelled cookstoves. We assessed; chronic respiratory symptoms, anthropometry, spirometric abnormalities (using Global Lung Initiative equations) and personal carbon monoxide (CO) exposure. Prevalence estimates were calculated, and multivariable analyses were done.

Results: We recruited 804 children (mean age 7.1 years, 51.9% female), including 476 (260 intervention; 216 control) from CAPS households. Chronic respiratory symptoms (mainly cough (8.0%) and wheeze (7.1%)) were reported by 16.6% of children. Average height-for-age and weight-for-age z-scores were -1.04 and -1.10, respectively. Spirometric abnormalities (7.1% low forced vital capacity (FVC); 6.3% obstruction) were seen in 13.0% of children. Maximum CO exposure and carboxyhaemoglobin levels (COHb) exceeded WHO guidelines in 50.1% and 68.5% of children, respectively. Children from CAPS intervention households had lower COHb (median 3.50% vs 4.85%, p=0.006) and higher FVC z-scores (-0.22 vs -0.44, p=0.05) than controls.

Conclusion: The substantial burden of chronic respiratory symptoms, abnormal spirometry and air pollution exposures in children in rural Malawi is concerning; effective prevention and control strategies are needed. Our finding of potential benefit in CAPS intervention households calls for further research into clean-air interventions to maximise healthy lung development in children.

Keywords: asthma epidemiology; lung physiology; paediatric asthma; paediatric lung disaese.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Air Pollution, Indoor / adverse effects*
  • Body Height
  • Body Weight
  • Carbon Monoxide / analysis
  • Carbon Monoxide / toxicity
  • Carboxyhemoglobin / metabolism
  • Child
  • Chronic Disease
  • Cooking
  • Cough / epidemiology
  • Cross-Sectional Studies
  • Environmental Exposure / adverse effects*
  • Female
  • Humans
  • Lung Diseases / epidemiology*
  • Lung Diseases / physiopathology*
  • Malawi / epidemiology
  • Male
  • Prevalence
  • Respiratory Sounds / etiology
  • Rural Population
  • Spirometry
  • Surveys and Questionnaires
  • Symptom Assessment
  • Vital Capacity

Substances

  • Carbon Monoxide
  • Carboxyhemoglobin