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Table 2 Percentage pain site response for RA, SLE and FM with the calculated differences between groups (including the combined RA/SLE group)

From: Distinguishing fibromyalgia from rheumatoid arthritis and systemic lupus in clinical questionnaires: an analysis of the revised Fibromyalgia Impact Questionnaire (FIQR) and its variant, the Symptom Impact Questionnaire (SIQR), along with pain locations

Location Healthy (n= 204) FM (n= 202) RA (n= 31) SLE (n= 20) RA minus SLE RA/SLE (n= 51) FM minus RA/SLE
Shoulders 14% 76% 32% 25% 7% 29% 48%
Jaws 4% 36% 3% 10% -7% 7% 30%
Arms 6% 69% 23% 10% 13% 16% 53%
Hands 5% 64% 81% 73% 9% 77% -13%
Hips 11% 79% 29% 28% 2% 28% 51%
Thighs 4% 55% 0% 0% 0% 0% 55%
Knees 10% 64% 39% 53% -14% 46% 18%
Feet 12% 50% 46% 63% -17% 54% -4%
Lateral upper back 6% 82% 15% 23% -8% 19% 64%
Lateral lower back 8% 80% 23% 20% 3% 22% 59%
Mid upper back 4% 77% 13% 15% -2% 14% 63%
Mid lower back 16% 79% 10% 25% -15% 18% 62%
Front of chest 4% 54% 10% 15% -5% 13% 42%
Neck 16% 91% 29% 55% -26% 42% 49%
Peripheral 7% 55% 28% 29% -1% 28% 26%
Axial 9% 77% 17% 25% -9% 21% 56%
  1. Note: Minus scores in the RA minus SLE column indicate that the SLE group had higher scores on that item. Minus scores in the FM minus RA/SLE column indicate that the RA/SLE group had higher scores on that item. FM, fibromyalgia; RA, rheumatoid arthritis; SLE, systemic lupus erythematosus.