The multidimensional health status measures discussed in the systematic review by de Korte et al1 aim to measure all aspects of the effect of psoriasis on patients' lives. Such an understanding of the impact of disease is vital for clinical practice and research.
One major associated condition having a considerable impact on the quality of life of people with psoriasis is inflammatory arthritis. This is a relatively common condition in people with psoriasis, with a rate between 7% and 42%,2,3 depending on the definition and ascertainment methods used, and considerably higher than the rate of inflammatory arthritis in the general population.4 Inflammatory arthritis is equally distributed among the sexes, and occurs at all ages, although in children there may only be a family history of psoriasis. Factors predictive of an associated inflammatory arthritis include psoriatic nail dystrophy5 and more severe cutaneous psoriasis.6
Kay L, Myers A, Walker D. Effects of Inflammatory Arthritis on Quality of Life in Patients With Psoriasis. Arch Dermatol. 2003;139(12):1655. doi:10.1001/archderm.139.12.1655-a