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Table 4 Item difficulty measures causing the different item hierarchies across diagnoses

From: Psychometric properties of the painDETECT questionnaire in rheumatoid arthritis, psoriatic arthritis and spondyloarthritis: Rasch analysis and test-retest reliability

Item difficulty
RA PsA SpA Across all diagnosis
5. Cold or heat painful (−0.93) 5. Cold or heat painful (−0.85) 5. Cold or heat painful (−0.79) 5. Cold or heat painful (−0.86)
3. Light touching painful (−0.02) 1.Burning sensations (−0.2) 7. Slight pressure pain (−0.32) 7. Slight pressure pain (−0.10)
1.Burning sensations (0.04) 7. Slight pressure pain (−0.05) 1.Burning sensations (−0.13) 1.Burning sensations (−0.10)
6. Numbness (0.04) 3. Light touching painful (0.04) 3. Light touching painful (−0.07) 3. Light touching painful (−0.02)
7. Slight pressure pain (0.06) 6. Numbness (0.08) 6. Numbness (0.00) 6. Numbness (0.04)
2.Tingling or prickling (0.25) 2. Tingling or prickling (0.44) 4. Sudden pain attacks (0.68) 2. Tingling or prickling (0.46)
4. Sudden pain attacks (0.45) 4. Sudden pain attacks (0.50) 2. Tingling or prickling (0.70) 4. Sudden pain attacks (0.54)
  1. The easiest item is the most endorsed item (lowest difficulty measure); the most difficult item is the least endorsed item (highest difficulty measure)