A researcher examined records of patients who had been readmitted for postoperative complications in order to identify predictive factors. This is a description of what type of study?

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In a retrospective study, participants are asked about exposure to the independent variable after it has occurred. In a prospective study, participants are followed forward in time to see if they develop the dependent variable of interest. In a trend study, different samples from the same population are studied at different points of time in regard to the same variable(s) of interest.

A Researcher Examined Records of Patients Who Had Been Readmitted