[2] The Psoriasis Index of Quality of Life (PSORIQOL) was published in 2003 by Galen Research.
The content of the PSORIQOL was derived from 62 qualitative interviews with psoriasis patients.
Face and content validity of the selected items were determined by a focus group and further interviews.
The PSORIQoL was then completed by two new samples of psoriasis patients by mail, in order to confirm validity and reliability.
[3] The PSORIQOL has been recognized by the National Institute for Health and Care Excellence as a suitable tool for assessing the impact of psoriasis on the patient.