Neighborhoods, daily activities, and measuring health risks experienced in urban environments

► Adolescents' hand-drawn neighborhood depictions did not correspond to the land area defined by administratively defined areas (e.g., census tract). ► The time adolescents spent in close proximity to alcohol outlets during one-day activities was not correlated with the prevalence of alcohol outlets in their census tract of residence. ► Classifying subjects as exposed based on the prevalence of an exposure in the geographic area of their residence may misrepresent the exposure that is etiologically meaningful.