A team of nurse researchers used existing data from the Nurses' Health Study to explore work variables associated with migraine headaches. This is an example of what kind of research?

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In secondary analysis, data that have already been collected for another study are subjected to additional analyses to answer new research questions. Methodological refers to research about study methods. Survey research is a type of descriptive research, usually using a questionnaire (survey).

A Team of Nurse Researchers Used Existing Data from the Nurses