Objectives: Our aim was to compare 20% with 10% to 5% incremental regimens in narrowband UVB phototherapy.
Study patients: The study included patients with psoriasis (N = 191) with Fitzpatrick skin phototypes II and III.
Results: Occurrence of erythema as well as maximum and cumulative doses were higher with 20% escalations, whereas response rates and time to response did not significantly differ.
Limitations: The study was limited by its retrospective nature.
Conclusion: A 5% or 10% incremental regimen may have similar therapeutic efficacy.