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Table 1 Baseline characteristics

From: The value of joint ultrasonography in predicting arthritis in seropositive patients with arthralgia: a prospective cohort study

Baseline characteristics Value in study population
(n = 163)
Age in years, mean ± SD 51 ± 11
Female sex, n (%) 121 (74%)
Arthralgia duration in months, median (IQR) 13 (6–36)
Number of reported painful joints, median (IQR) 8 (4–19)
Tender joint count (53 joints), median (IQR) 1 (0–5)
VAS pain in mm (0–100), mean ± SD 35 ± 25
Antibody status
 ACPA negative, RF positive, n (%) 72 (44%)
 ACPA positive, RF negative, n (%) 44 (27%)
 ACPA positive, RF positive, n (%) 47 (29%)
  1. ACPA anti-citrullinated protein antibodies, IQR interquartile range, RF rheumatoid factor, SD standard deviation, VAS visual analog scale