Psoriatic arthritis impact of disease (PsAID12) (continued) PsAID12 SCORING AND CALCULATION RULES The PsAID is calculated based on 12 Numerical rating scales (NRS) questions. Each NRS is assessed as a number between 0 and 10. 3. Calculation Item Coefcent NRS value PsAID1 (pain) X3 0-10 PsAID2 (fatigue) X2 0-10 PsAID3 (skin) X2 0-10 PsAID4 (Work and/or leisure activities) X2 0-10 PsAID5 (function) X2 0-10 PsAID6 (discomfort) X2 0-10 PsAID7 (sleep) X2 0-10 PsAID8 (coping) X1 0-10 PsAID9 (anxiety) X1 0-10 PsAID10 (embarrassment) X1 0-10 PsAID11 (social life) X1 0-10 PsAID12 (depression) X1 0-10 PsAid fnal value (sum): Final sum devided by 20: The total is divided by 20. Thus, the range of the fnal PsAID value is 0-10 where higher fgures indicate worse status. 4. Missing data imputation If one of the 12 NRS values composing the PsAID is missing, the imputation is as follows: a. calculate the mean value of the 11 other (non-missing) NRS (range, 0-10) b. impute this value for the missing NRS c. Then, calculate the PsAID as explained above. If 2 or more of the NRS are missing, the PsAID is considered as missing value (no imputation). 49
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