In an attempt to compare treatment strategies in various psychiatric settings,researchers are evaluating the psychiatric patients' levels of depression every four months for four years in three different hospitals.What type of research are they applying?

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The researchers are evaluating the same psychiatric patients' levels of depression every four months for four years, which indicates that they are conducting a longitudinal research study, tracking changes in the patients' depression levels over time. Cross-sequential research involves comparing different age groups at different points in time, while cross-sectional research involves comparing different age groups at a single point in time. Naturalistic research involves observing individuals in their natural settings without intervention, which is not the case in this scenario.

In an Attempt to Compare Treatment Strategies in Various Psychiatric