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INDOOR NITROGEN DIOXIDE, GAS COOKING AND ASTHMA 1735
<br />Acknowledgements
<br />All authors had full access to all the data and take
<br />responsibility for the integrity of the data, the accur-
<br />acy of the data analysis and the accuracy and com-
<br />pleteness of references. W.L., U.G. and B.B. conducted
<br />the literature search independently and decided on
<br />inclusion of studies. Discrepancies among the authors
<br />KEY MESSAGES
<br />were discussed and adjudicated. W.L. and U.G. ex-
<br />tracted the data. W.L. did the statistical analyses
<br />and wrote the manuscript. U.G. and B.B. critically
<br />reviewed the manuscript and provided important
<br />intellectual content.
<br />Conflict of interest: None declared.
<br />The last meta-analysis of the respiratory health effects of indoor NO, exposure was published almost
<br />20 years ago. The current paper provides an up-to-date review of the literature with childhood
<br />respiratory health data that used either indoor NO, or the use of gas for cooking as the exposure
<br />metric.
<br />Household gas cooking is associated with increased odds of current asthma and lifetime asthma in
<br />children. The risk of overall asthma in children with gas cooking exposure was 1.32 (95% confidence
<br />interval, 1.18-1.48).
<br />. The risk of childhood current wheeze increases by 15% per 15 -ppb increase in indoor NO2 levels.
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