Demographic information of the study population by facility.
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资源简介：
N = number of dogs examined, F = females, M = males; mean age in years, SD = standard deviation.
N为受检犬只总数，F指代雌性犬，M指代雄性犬；平均年龄以年为单位，SD为标准差(standard deviation)。
创建时间：
2018-01-19
