Chronic pruritus: which itch assessment scale is best?

  • Jang YH & al.
  • J Am Acad Dermatol
  • 27 Jun 2019

  • International Clinical Digest
Access to the full content of this site is available only to registered healthcare professionals. Access to the full content of this site is available only to registered healthcare professionals.

Takeaway

  • A comparative assessment of itch assessment scales (visual analog scale [VAS], numeric rating scale [NRS], verbal rating scale [VRS], and itch severity scale [ISS]) for chronic pruritus finds that the ISS has the best retest reliability.

Why this matters

  • Chronic pruritus affects many dermatology patients, necessitating valid and reliable measurement tools.

Key results

  • VAS, NRS, and VRS were strongly correlated at initial visit (Spearman’s correlation coefficient, 0.86 for VAS vs NRS, 0.81 for NRS vs VRS, 0.72 for VAS vs VRS) and follow-up (0.92 for VAS vs NRS, 0.83 for NRS vs VRS, 0.80 for VAS vs VRS).
    • ISS showed low intercorrelation validity with these tools at initial visit (0.54 vs VAS, 0.60 vs NRS, 0.62 vs VRS) and follow-up (0.63 vs VAS, 0.66 vs NRS, 0.64 vs VRS).
  • ISS had a higher intraclass coefficient at retest (0.89) compared with VAS (0.77), NRS (0.77), and VRS (0.75).
  • ISS had the best correlation with the Itchy Quality of Life tool at initial visit (0.73 and 0.70, respectively). 

Study design

  • 419 patients with chronic pruritus were included.
  • Funding: Ministry of Health & Welfare, Republic of Korea.

Limitations

  • Patient heterogeneity.
  • Potential recall bias.

Please confirm your acceptance

To gain full access to GPnotebook please confirm:

By submitting here you confirm that you have accepted Terms of Use and Privacy Policy of GPnotebook.

Submit