Better home heating can check asthma, says a New Zealand study.
It will certainly reduce the number of days children are away from school.
A recently published study by the University of Otago, Wellington shows that installing heat pumps, wood or pellet burners or flued gas heaters is the key to cutting school sick days for children with asthma.
The study of 269 children by the He Kainga Oranga/Housing and Health Research Programme shows that more effective energy-efficient heating in homes previously using unflued gas heaters, open fires or low-kilowatt electric heaters, reduces winter school absences for asthmatic children by an average of 21 per cent; or nearly two days in the winter middle terms.
"This represents a large number of preventable school absences when taken over the one in four (148,000) children in New Zealand between five and fourteen who have asthma," says lead investigator Sarah Free.
"Overall this corresponds to about 84 000 potentially preventable days of school absence each winter for the asthmatic children, and of course we expect the additional heating to have also improved the health of other children and teenagers in the house."
It is well recognised that New Zealand houses are poorly insulated and cold by international standards. One million houses need retro-fitted insulation and better heating, while two percent of homes use no heating at all.
The average indoor temperatures in many NZ houses are below the WHO recommended minimum of 18 degrees celcius.
For NZ children less than five years old, mortality associated with respiratory diseases is estimated to be 2.5 times higher in winter. Similarly hospital admissions for children under five are higher during winter, and higher for those living in pre-war housing and lower socio-economic areas.
A large number of New Zealand homes (30 per cent) use cheaper unflued gas heating, which produces significant amounts of water vapour, encouraging the growth of mould and fungi which may aggravate asthma symptoms. These heaters also produce high levels of nitrogen dioxide (NO2), shown to make asthma worse.
The potential impact of the projected electricity price-rises this winter is concerning to Sarah Free, "As power prices are set to rise in most parts of New Zealand this winter there is a risk that families will cut back on home heating to save money. This study makes me worry about the educational impacts of that price rise."
The study supplied half of 409 households with better heating in Porirua, the Hutt Valley, Christchurch, Dunedin and Bluff. The other 50 per cent of households without heaters acted as a control group. Then school absences for asthmatic children were checked with respective schools during the two winter terms.
"One additional aspect of this study is that overseas research has shown that improved attendance at school means better academic results, so having a warm home helps school achievement. It also assists family relationships as people feel better about staying at home and have increased enthusiasm for family life," Sarah Free said.
This study has recently been published in the Journal of Epidemiology and Community Health
. It was funded by the Health Research Council, Contact Energy, Ministry of Environment, EECA, Hutt Valley DHB, Capital and Coast DHB, the LPG Associaton.