This study used the Integrated Data Infrastructure (IDI), which is a large database of individual-level data maintained by Stats New Zealand. Currently, it contains 166 billion pieces of information on education, benefits, tax, families and households, health, justice and migration.
Using these data, we were able to track where children lived from birth until age 18, calculate the greenness of their neighbourhoods using satellite imagery and land-use data, and link to health records throughout each child’s life. This was all done anonymously, in a secure data lab, to safeguard the children’s privacy.
This study is an unusual collaboration between economists at the US Forest Service and epidemiologists in New Zealand. It contributes to our understanding of why asthma is on the rise.
Our results may lead to some innovative strategies to combat asthma, although there is a need to elucidate the underlying immunological mechanisms.
Improved prevention and treatment options for asthma are urgently needed as the burden of asthma is considerable, with 334 million people affected worldwide. Asthma prevalence in English-speaking countries such as New Zealand, Australia, the US and the UK is particularly high, with approximately one in six people suffering from it.