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Table 2 Mokken scale analysis at baseline, Week 1 and Week 12

From: Development, psychometric evaluation and cognitive debriefing of the rheumatoid arthritis symptom and impact questionnaire (RASIQ)

Scale Baseline Week 1 Week 12
Item scalability coefficient Test scalability coefficient Item scalability coefficient Test scalability coefficient Item scalability coefficient Test scalability coefficient
Common scale (16 items) 0.37–0.69 0.60 0.40–0.74 0.66 0.53–0.80 0.73
Joint pain (7 items) 0.77–0.82 0.79 0.82–0.87 0.84 0.86–0.89 0.88
Joint stiffness (4 items) 0.64–0.71 0.68 0.59–0.71 0.65 0.74–0.80 0.76
Impact (5 items) 0.44–0.56 0.50 0.50–0.58 0.55 0.65–0.71 0.68