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Table 1 Demographic, clinical, and laboratory characteristics of patients with psoriatic arthritis, rheumatoid arthritis, and controls

From: Dynamic magnetic resonance of the wrist in psoriatic arthritis reveals imaging patterns similar to those of rheumatoid arthritis

Characteristic Psoriatic arthritis Rheumatoid arthritis (group I) Matched rheumatoid arthritis (group II) Controls
Number of patients 15 49 30 8
Age (years) 55.7 ± 10.7 57.6 ± 14.6 56.3 ± 16.3 38.1 ± 21.9
Sex (women/men)* 8/7 42/7 20/10 4/4
Disease duration (months) 63.5 ± 62.7 93.5 ± 98.7 78.2 ± 86.2 NA
Morning stiffness (minutes) 70.4 ± 55.7 96.2 ± 96.3 76.8 ± 92.1 NA
Number of tender joints* 8.0 ± 5.5 13.7 ± 9.4 9.1 ± 7.3 0
Number of swollen joints 5.3 ± 4.4 8.0 ± 5.8 5.0 ± 3.9 0
Ritchie index 8.3 ± 5.7 11.6 ± 6.9 7.0 ± 5.1 0
ESR (mm/h) 34.7 ± 21.8 49.1 ± 31.6 45.5 ± 35.7 ND
CRP (mg/l) 30.4 ± 39.4 30.3 ± 34.4 26.6 ± 36.1 ND
Number of patients with IgM rheumatoid factor** 1 (6.7%) 33 (67.3%) 18 (60%) ND
Rate of early enhancement§ 1.0 ± 0.6 1.6 ± 0.7 1.3 ± 0.7 0.1 ± 0.1
Relative enhancement § 87.1 ± 39.2 125.8 ± 48.0 107.3 ± 48.2 15.5 ± 19.2
  1. Values are expressed as means ± standard deviations except for sex and IgM rheumatoid factor, for which the percentage of positive patients is reported. *P < 0.05 for the comparison between PsA and groupI RA; **P < 0.001 for the comparison between PsA and groupI RA and P < 0.05 for the comparison between PsA and groupII RA; §P < 0.001 by one-way analysis of variance between PsA patients, groupI RA patients, and controls.