What are the key data to collect for such studies ?
To provide a detailed answer, could you please clarify what type of studies you are referring to? For example, are you looking into medical studies, social science research, market research, environmental studies, or something else? Each type of study has its own key data points that are important to collect.
The key data to collect for such studies would include demographic information, medical history, lifestyle habits, physical measurements, laboratory results, and environmental exposures.