The Perceived Stress Scale (PSS) is a representative instrument used to measure stress. The original PSS comprises 14 items (PSS-14) in two subscales, but 10- and 4-item versions are also available (PSS-10 and 4, respectively). The target populations of psychometric studies using the PSS have far mainly comprised college students, and the underlying constructs of the PSS versions are controversial: one factor vs. two factors and first order vs. second order.