One measure showed children with dogs were reported as being healthy for about 73% of the time, based on weekly questionnaires, compared with about 65% of children with no dog contact at home. While the study tracked just under 400 babies, the researchers said the results were statistically significant because it relied on weekly questionnaires filled out by parents.

该研究中基于每周问卷调查的统计显示，养狗家庭小孩约73%的时间都是健康状态，而无狗家庭小孩的这一比例约为65%。尽管研究只追踪了不到400名小孩，但研究者称这些结果在统计学上具有显著意义，因为它依靠的是家长们填写的每周问卷。

Dr. Bergroth explained that children who lived in households where dogs spent 18 or more hours a day outside, showed the most healthy days, fewer fevers and the least use of antibiotics compared with babies with no dog at home. One theory is dogs that spend a lot of time outside likely bring more dirt and bacteria inside the home compared with dogs and cats that spend more time indoors, she said. Researchers believe that exposure to dirt and bacteria builds up babies' immune systems.

伯格罗斯博士解释说，与无狗家庭的小孩相比，那些每日在户外时间18小时以上的狗所属家庭的小孩健康的天数最多，更少发烧，抗生素的使用也最少。她说，一种理论是，长时间在户外活动的狗可能比常在室内的狗和猫带回更多尘土和细菌。研究人员认为接触尘土和细菌会增强宝宝的免疫系统。

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