The Perceived Stress Scale (PSS) is the most widely used psychological instrument for measuring the perception of stress. It is a measure of the degree to which situations in one’s life are appraised as stressful. Items were designed to tap how unpredictable, uncontrollable, and overloaded respondents find their lives. High levels of stress are associated with poor self-reported health, elevated blood pressure, depression, and susceptibility to infection.
Cohen, S., Kamarck, T., & Mermelstein, R. (1983).