The aim of this study was to conduct a longitudinal test of an explanatory model of depression, where religiosity and/or spirituality (R/S) represents a potentially protective factor in college students in the USA. A Web-based survey was administered monthly to 214 students from religious and public colleges. At 1 month and 6 months, the measures of R/S, depression, stress, and cognitive vulnerability were administered. Between 2 and 5 months, only the measures of stress and depression were administered. The data were analyzed to test the hypothesis that R/S buffers the effect of stress on depression over time in the context of cognitive vulnerability. The results supported a direct and protective effect over time between R/S and depression, but a buffering effect on the relationship between stress and depression was not found. Although all aspects of R/S were demonstrated to protect the participants from depression, it did not appear that the relationship between R/S and stress or R/S and cognitive vulnerability explains this relationship. Nurses who are working with college students should take holistic approaches to their emotional difficulties, realizing the potentially beneficial effects of students' religiousness or spirituality.
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