Table 4. Adjusted odds ratios and their 95% confidence intervals for pet exposure and relation to self-reported respiratory symptoms, controlling for age,* sex, smoking habits, and residential environments.

	odds ratio	95% confidence interval
Dogs	0.99	0.79-1.24
Cats	1.07	0.79-1.45
Birds	1.07	0.72-1.58
Hamsters	1.57	1.18-2.10

*: The age was divided into three intervals (<20 years, 20-59 years, and 60+ years).