The Visual Analogue Scale (VAS) is a self-report measure consisting simply of a 10 centimeter line with a statement at each end representing one extreme of the dimension being measured (most often intensity of pain). The respondent gives their indication with a pen mark on the line corresponding to their answer, e.g. the present pain level. It is a widely used, noted for ease of administration. When used to measure pain, it reliably differentiates between sensory and affective pain.
Reliability and Validity
Scott J, Huskisson EC (1979) Vertical or horizontal visual analogue scales Annals of Rheumatological Disease 38, 560. Revill SI, Robinson JO, Rosen M et al (1976) The reliability of a linear analogue for evaluating pain Anaesthesia 31, 1191 - 8
Downie WW, Leatham PA, Rhind VM et al (1978) Studies with pain rating scales Annals of Rheumatology Disease 37, 378 ñ 381
Administration, Analysis and Reporting
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E.C. Huskisson (1974) Measurement of pain. The Lancet 9, 2, 1127-1131.