Visual Analogue Scale to Evaluate Fatigue Severity (VAS-F)

The scale consists of 18 items relating to the subjective experience of fatigue. Each item asks respondents to place an “X,” representing how they currently feel, along a visual analogue line that extends between two extremes (e.g., from “not at all tired” to “extremely tired”). In contrast to discrete, Likert-type scales, the VAS-F places fewer restrictions on the range of responses available to individuals. However, the benefits of a visual analogue scale may be offset by the frequent reluctance of individuals to use the highest and lowest extremes.