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Mixed\u2010effects linear regression models were used to test the relation of hand function with disease group, age, and sex.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Two hundred ninety\u2010nine subjects were tested, 101 with RA, 92 with PsA, and 106 nonarthritic controls (51 with psoriasis and 55 healthy controls [HCs]). Regression analysis showed that hand function was influenced by age, sex, disease group, and hand dominance (<jats:italic>P<\/jats:italic> &lt; 0.001 for all). The impact of PsA and RA on hand function was comparable and generally more pronounced in women. Both PsA and RA led to significantly enhanced age\u2010related loss of grip strength, fine\u2010motor skills, and self\u2010reported hand function in patients with PsA and RA compared with HCs. In addition, patients with psoriasis showed significant impairment of hand function compared with HCs.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>RA and PsA have a comparable impact on the decline of strength, fine\u2010motor skills, and self\u2010reported function of the hand. Unexpectedly, patients with psoriasis also show impaired hand function that follows a similar pattern as observed in patients with PsA.<\/jats:p><\/jats:sec>","DOI":"10.1002\/acr2.11196","type":"journal-article","created":{"date-parts":[[2020,11,26]],"date-time":"2020-11-26T02:29:23Z","timestamp":1606357763000},"page":"734-740","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":29,"title":["Similar Impact of Psoriatic Arthritis and Rheumatoid Arthritis on Objective and Subjective Parameters of Hand Function"],"prefix":"10.1002","volume":"2","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0739-1959","authenticated-orcid":false,"given":"Anna\u2010Maria","family":"Liphardt","sequence":"first","affiliation":[{"name":"Friedrich\u2010Alexander\u2010Universit\u00e4t Erlangen\u2010N\u00fcrnberg and Universit\u00e4tsklinikum Erlangen Erlangen 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