Environmental exposures associated with early childhood recurrent wheezing in the mother and child in the environment birth cohort: a time-to-event study.

42 In our findings, although an increasing trend in prevalence existed for family history of asthma in the different wheeze categories (14% among those without wheezing; 20% among single wheezing and 21% among recurrent wheezing), we were not able to objectively test for asthma.

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Per unit increase in pollutant (both NO 2 and PM 2.5 ) measured in the month of birth, resulted in a 2%–4% adjusted increase in risk for single or recurrent wheeze compared with no wheeze, although these did not reach statistical significance.

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