de·mo·graph·ic /ˌdɛməˈgræfɪk, ˌdimə-/
  (a.)人口統計學的
  de·mo·graph·ic /ˌdɪməˈgræfɪk, ˌdɛmə-/ 形容詞
  人口統計的
  de·mog·ra·phy n.  The study of vital statistics, such as births, deaths, marriages, mortality, health, etc., in populations and subgroups of populations. -- Dem*o*graph*ic, a.
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  demographic
       adj : of or relating to demography; "demographic surveys"
       n : a statistic characterizing human populations (or segments of
           human populations broken down by age or sex or income
           etc.)