When compiling community health information from various public sources, which detail is most challenging to ascertain?

The specific challenge in ascertaining which other states community members have lived in and for how long stems from the complexity and variability of personal data collection. Unlike demographic statistics such as age distribution or the availability of local health services, which can be gathered through official census data or local health department records, information about individual residential histories is not typically recorded in public databases. This type of information is personal and often sensitive, making it less accessible due to privacy concerns and the lack of centralized data collection methods. Consequently, obtaining accurate and comprehensive data regarding past residence locations and durations presents significant difficulties compared to more readily available community health metrics.