The DASS was first developed in 1995 by researchers Antony, Bieling, Pixton, and Swinson. The original 42-item questionnaire was designed to assess the three negative emotional states of depression, anxiety, and stress. In 2002, a shortened 21-item version, the DASS-21, was developed to provide a more efficient and practical assessment tool. The DASS-21 has since become a popular and widely used measure in both research and clinical settings.
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If you are looking for the seminal research paper or the physical assessment "paper" for the (Depression, Anxiety, and Stress Scale), it is a widely used clinical instrument. The DASS was first developed in 1995 by