A comparison of three times vs. five times weekly narrowband ultraviolet B phototherapy for the treatment of chronic plaque psoriasis.

Background: Narrowband ultraviolet B (NB-UVB) phototherapy is an effective treatment for psoriasis.

Objectives: To compare the effects of three and five times weekly NB-UVB phototherapy in the treatment of chronic plaque psoriasis.

Methods: Sixty-five patients with chronic plaque psoriasis were allocated to receive three or five times weekly NB-UVB, starting at low dose.