期刊
ACTA DERMATO-VENEREOLOGICA
卷 92, 期 5, 页码 502-507出版社
ACTA DERMATO-VENEREOLOGICA
DOI: 10.2340/00015555-1246
关键词
itch; measurement tools; clinical trial; International Forum for the Study of Itch; concurrent validity
类别
The most commonly used tool for self-report of pruritus intensity is the visual analogue scale (VAS). Similar tools are the numerical rating scale (NRS) and verbal rating scale (VRS). In the present study (initiated by the International Forum for the Study of Itch) assessing reliability of these tools, 471 randomly selected patients with chronic itch (200 males, 271 females, mean age 58.44 years) recorded their pruritus intensity on VAS (100-mm line), NRS (0-10) and VRS (four-point) scales. Re-test reliability was analysed in a subgroup of 250 patients after one hour. Statistical analysis showed a high reliability and concurrent validity (r>0.8; p<0.01) for all tools. Mean values of all scales showed a high correlation. In conclusion, high reliability and concurrent validity was found for VAS, NRS and VRS. On re-test, higher correlation and less missing values were observed. A training session before starting a clinical trial is recommended.
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