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NailQoL: a quality-of-life instrument for onychomycosis
Erin M Warshaw1, Jovonne K Foster, Peter M H Cham
1Department of Dermatology, University of Minnesota, School of Medicine, Minneapolis, MN, USA. erin.warshaw@med.va.gov
Background:
The disease burden onychomycosis is not trivial. The aim is to develop a quality of life instrument to measure the onychomycosis burden.
Methods:
402 patients with mycologically-confirmed onychomycosis completed a baseline questionnaire of 39 quality of life items (modified Skindex-29 questions and 10 additional nail-specific questions). Internal consistency, reproducibility and responsiveness of the final instrument, NailQoL were measured.
Results:
15 items consisting of symptom (3), emotion (10), and functional (2) domains were retained in NailQoL. Symptom and emotion subscales = 0.80-0.92. Administration alpha demonstrated good internal consistency (Cronbach's of the instrument to 46 patients at one month after baseline revealed good reproducibility (ICC 0.88-0.91). Responsiveness was measured in 292 patients at 18 months; statistically significant better NailQoL scores were found in individuals with complete cure (mycological and clinical) (P < 0.01).
Conclusion:
NailQoL represents a new concise, valid, reliable, and responsive instrument for measuring burden of skin disease for patients with onychomycosis.
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