Table 1.

Results of the descriptive analysis. ACPA = antibodies against citrullinated peptides, RF-IgM = rheumatoid factor IgM, y = years, n = number, SD = standard deviation.

Characteristics
Number of patients (women/men)	33 (21/12)
Mean age (y) (SD; range)	55 (11.8; 23–75)
Mean symptom duration (y) (SD; median; range)	1.7 (3.8; 0; 0–16)
Mean CRP (mg/L) (SD; median; range)	18.3 (30.3; 3.4; 0.3–132.0)
ACPA-positive (>20 U/mL), n	6 (18.2%)
RF-IgM-positive (>14 U/mL), n	12 (36.4%)