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Table 3 Association between baseline characteristics and development of inflammatory arthritis using univariate logistic regression analysis and multivariate logistic regression analysis after multiple imputation (n = 174)

From: Absence of ultrasound inflammation in patients presenting with arthralgia rules out the development of arthritis

  Univariate model Multivariate model including US synovitis Multivariate model including presence of PD
OR (95% CI) p Value OR (95% CI) p Value OR (95% CI) p Value
Demographics
 Age, years 1.06 (1.03–1.09) < 0.001 1.06 (1.03–1.10) < 0.001 1.07 (1.04–1.10) < 0.001
 Sex 0.84 (0.42–1.70) 0.627     
 BMI 0.98 (0.92–1.04) 0.438     
Clinical variables
 Tender joints, range 0–44 1.01 (0.96–1.07) 0.676     
 DAS28 1.21 (0.92–1.58) 0.175     
 Morning stiffness > 30 minutes 2.39 (1.20–4.73) 0.013 2.80 (1.33–5.90) 0.007 3.34 (1.60–6.96) 0.001
 Rheumatoid factor-positive 1.21 (0.65–2.23) 0.545     
 ACPA-positive 2.08 (1.07–4.07) 0.032 2.35 (1.13–4.87) 0.021   
 ESR 1.00 (0.98–1.02) 0.850     
USa
 US-positive 3.03 (1.69–5.41) < 0.001 2.65 (1.44–4.88) 0.007   
 PD-positive 3.12 (1.61–6.03) 0.001    3.44 (1.71–6.95) 0.001
  1. Abbreviations: ACPA Anti-citrullinated protein antibody, BMI Body mass index, DAS28 Disease Activity Score in 28 joints, ESR Erythrocyte sedimentation rate, IA Inflammatory arthritis (defined as clinical soft tissue swelling), PD Power Doppler, US Ultrasound
  2. aUS synovitis definition: greyscale > 1 and/or PD > 0