“…The most frequently analysed PROs were function [83,84,86,89,92,94], quality of life [9,14,84,[91][92][93] and fatigue [83,85,87,93], but some studies evaluated the impact of comorbidity on pain [83,84,91,98], work disability [88] or sleep quality [93,96,97] The impact of comorbidity on PROs of PsA patients was examined using the CCI in two large, high-quality prospective cohorts [83,86]. In the first study (using DANBIO, a nationwide registry of biological therapies in Denmark), the authors noted that a higher score on the CCI was associated with worse function, pain, fatigue and PGA (univariate analyses) [83].…”