Variables | Unadjusted PSD | Differences⋄ | |||
---|---|---|---|---|---|
RA, n = 2642, Mean (SD) or % | FM, n = 806, Mean (SD) or % | Unadjusted Difference | Unadjusted ES | Adjusted Difference | |
Figure 2 | |||||
Pain, 0–10 | 6.4 (2.2) | 6.6 (2.1) | −0.17† | 0.09 | −0.06† |
Global, 0–10 | 6.0 (2.1) | 6.1 (2.0) | −0.09† | 0.04 | 0.02† |
HAQ, 0–3 | 1.6 (0.6) | 1.3 (0.6) | 0.26 | −0.45 | 0.27 |
QoL, 100–0* | 52.3 (18.5) | 51.9 (19.1) | 0.75† | −0.02 | 0.22† |
Figure 3 | |||||
WPI, 0–19 | 13.2 (4.4) | 13.7 (5.7) | −0.44 | 0.11 | 0.34 |
SSS, 0–12 | 7.6 (1.9) | 8.2 (2.0) | −0.53 | 0.32 | 0.34 |
Symptoms, 0–36 | 15.1 (6.4) | 16.6 (6.1) | −1.29 | 0.24 | −0.86 |
Joint count, 0–18 | 14.4 (3.8) | 12.8 (4.6) | 1.62 | 0.38 | 1.80 |
Figure 4 | |||||
Opioids | 49.9 | 53.6 | −3.38† | 0.87Δ | −2.69† |
Pregabalin | 7.3 | 21.7 | −14.15 | 0.29Δ | −12.26 |
Prednisone | 34.2 | 6.1 | 27.69 | 7.72Δ | −26.20 |
Smoking | 16.1 | 20.5 | −4.09 | 0.75Δ | −4.46 |
Other variables | |||||
BMI | 31.1 (8.2) | 32.1 (8.0) | −0.71 | 0.11 | −0.50† |
Income, US$ | 44,952 (30,547) | 44,379 (30,129) | 1103† | −0.02 | −398† |
PCS, 100–0* | 28.7 (7.6) | 29.6 (97.6) | −0.90 | 0.13 | −0.98 |
MCS, 100–0* | 39.4 (11.4) | 38.1 (11.6) | 1.14 | 0.11 | 0.76† |
College* | 29.8 | 30.9 | 0.03† | 1.00Δ | −0.82† |
↵* Lower values are more abnormal.
↵† p > 0.05.
↵⋄ Adjusted and unadjusted differences refer to adjustment by PSD values, and all variables are adjusted for age and sex.
↵Δ Unadjusted OR. FM: fibromyalgia; RA: rheumatoid arthritis; PSD: polysymptomatic distress; ES: effect size; HAQ: Health Assessment Questionnaire; QoL: Quality of Life; WPI: widespread pain index; SSS: symptom severity scale; BMI: body mass index; PCS: physical component summary of Medical Outcomes Study Short Form-36 (SF-36); MCS: SF-36 mental component summary.