The target audience is often segregated by factors such as demographic and psychographic differences. Statistical normality is important in determining demographic pathologies. Apple segments its customer base by using behavioral, demographic, and psychographic factors. Personal income statistics are given in accordance to a variety of demographic characteristics. It may also become a factor in societal and demographic collapse. Readership tends towards a well-educated demographic. Audience response of the targeted family demographic to the musical has been generally positive. Most importantly it made great gains among the 18-to-49 age demographic sought by advertisers. Slums sprout and continue for a combination of demographic, social, economic, and political reasons. These regulations were responsive to demographic and economic pressure. Admissions officers tend to be in the 30-to-40 age demographic. Progress varied widely across demographic and national groups. Fruits and vegetables are associated with positive mood, independent of demographic or lifestyle factors. Special procedures were developed relying on both polls and demographic analysis. Some of these estimates rely in part on demographic losses.