Associations of pet ownership during childhood with wheezing phenotypes.

* Relative risk ratios (95% CI) from multinomial logistic regression compared with ‘never/infrequent’ wheezing phenotype, adjusted for sex of child, maternal history of asthma or allergy, maternal smoking during pregnancy, and family adversity index.
** “Age 3 years or later, not before” = owned at or after age 33 months but not at any time before; “Before and after age 3 years” = owned at any time before age 33 months and at any time thereafter; “Before but not after 3 years” = owned at any time before, but not owned at or at any time after, age 33 months.
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