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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