Qualitative interviews were conducted with 48 patients, after which a 51-item questionnaire was created. A follow-up survey with 94 patients was then conducted which reduced the items to 35. An additional 286 patients were surveyed and Rasch analysis was performed, which finalized the PsAQoL to 20 items.[4] A high score on the PsAQoL indicates a lower quality of life.
The Psoriatic Arthritis Quality of Life measure has been translated into 30 languages, other than UK English.[5] These languages include Dutch[6] and Swedish.[7]
The PsAQoL has also been utilized in clinical research studies in order to determine whether a medication or treatment is effective in treating psoriatic arthritis. If the scores on the PsAQoL change after treatment, this means that the given treatment has had an effect on quality of life. The PsAQoL has been used to evaluate infliximab[8] and adalimumab.[9]
^Brodszky, V; Pentek, M; Balint, PV; Geher, P; Hajdu, O; Hodinka, L; Horvath, G; Koo, E; Polgar, A; Sesztak, M; Szanto, S; Ujfalussy, I; Gulacsi, L (August 2010). "Comparison of the Psoriatic Arthritis Quality of Life (PsAQoL) questionnaire, the functional status (HAQ) and utility (EQ-5D) measures in psoriatic arthritis: results from a cross-sectional survey". Scandinavian Journal of Rheumatology. 39 (4): 303–309. doi:10.3109/03009740903468982. PMID20166848. S2CID26425942.
^Roussou, Euthalia; Chopra, Sunil; Ngandu, Danny Lunda (2013). "Phenotypic and clinical differences between Caucasian and South Asian patients with psoriatic arthritis living in North East London". Clinical Rheumatology. 32 (5): 591–599. doi:10.1007/s10067-012-2139-5. PMID23247553. S2CID20766186.
^Mease, Philip J. (November 2011). "Measures of Psoriatic Arthritis". Arthritis Care & Research. 63 (S11): S64–S85. doi:10.1002/acr.20577. PMID22588772.
^"Measures Database". Galen-Research.com. Galen Research. Retrieved 9 October 2013.
^Billing, E; McKenna, SP; Staun, M; Lindqvist, U (May 2010). "Adaptation of the Psoriatic Arthritis Quality of Life (PsAQoL) instrument for Sweden". Scandinavian Journal of Rheumatology. 39 (3): 223–228. doi:10.3109/03009740903347975. PMID20063984. S2CID30670329.