Depression, Anxiety, Stress Scale
(DASS-21)

The DASS-21 is the short form of the DASS-42, a self-report scale designed to measure the negative emotional states of depression, anxiety and stress. As the three scales of the DASS have been shown to have high internal consistency and to yield meaningful discriminations, the scales should meet the needs of both researchers and clinicians who wish to measure current state or change in state over time (e.g., in the course of treatment). This scale is suitable for clinical and non-clinical settings.
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Please read each statement and choose a number 0, 1, 2 or 3 that indicates how much the statement applied to you over the past week. There are no right or wrong answers. Do not spend too much time on any statement.
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NEVER - Did not apply to me at all
SOMETIMES - Applied to me to some degree, or some of the time
OFTEN - Applied to me to a considerable degree, or a good part of time
ALMOST ALWAYS - Applied to me very much, or most of the time

Referece:

Henry, J. D., & Crawford, J. R. (2005). The short‐form version of the Depression Anxiety Stress Scales (DASS‐21): Construct validity and normative data in a large non‐clinical sample. British Journal of Clinical Psychology, 44(2), 227-239.