Psoriatic arthritis impact of disease (PsAID9) (continued) PsAID9 SCORING AND CALCULATION RULES The PsAID is calculated based on 9 Numerical rating scales (NRS) questions. Each NRS is assessed as a number between 0 and 10. 3. Calculation Item Coefcent NRS value PsAID1 (pain) X0.174 0-10 PsAID2 (fatigue) X0.131 0-10 PsAID3 (skin) X0.121 0-10 PsAID4 (Work and/or leisure activities) X0.110 0-10 PsAID5 (function) X0.107 0-10 PsAID6 (discomfort) X0.098 0-10 PsAID7 (sleep) X0.089 0-10 PsAID8 (coping) X0.087 0-10 PsAID9 (anxiety) X0.085 0-10 PsAid fnal value (sum): Final sum devided 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 9 NRS values composing the PsAID is missing, the imputation is as follows: a. calculate the mean value of the 8 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). 46
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