Studies comparing Numerical Rating Scales, Verbal Rating Scales, and Visual Analogue Scales for assessment of pain intensity in adults: a systematic literature review.

By M. Hjermstad, P. Fayers, D. Haugen, A. Caraceni, G. Hanks, J. Loge, R. Fainsinger, N. Aass, S. Kaasa. Journal of Pain and Symptom Management, 2011

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Childhood Functional Gastrointestinal Disorders: Neonate/Toddler. (2016, background): “Typically, a numeric rating scale in which pain can be quantified is used.(94) This addresses pain intensity only, and not the quality of the pain, but is often the cornerstone of clinical pain care.”
Test–retest reliability, validity, and minimum detectable change of visual analog, numerical rating, and verbal rating scales for measurement of osteoarthritic knee pain (2018, methodology): “Several scales are commonly used for the assessment of pain intensity.(7,8) Among them, the NRS, VAS, and VRS are often used in clinical practice.”
SWOT analysis applications: An integrative literature review (2021, methodology): “Survey questionnaires are also widely used in SWOT studies (Dawes, 2002; Herdman et al., 2011; Hjermstad et al., 2011; Preston & Colman, 2000).”
The Edmonton Symptom Assessment System 25 Years Later: Past, Present and Future Developments (2016, positive): “NRS was easier to complete and report, and the findings generally corresponded with VAS.”