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Table 1 Demographic characteristics of RA patients at baseline and healthy controls

From: Circulating surfactant protein -D is low and correlates negatively with systemic inflammation in early, untreated rheumatoid arthritis

Characteristics RA patients (N = 160) Controls (N = 1476) P-value
Gender f/m (%women) 107/53 (67%) 761/715 (52%) P < 0.001
Age in years 53(42 to 63) 38 (29 to 46) P < 0.001
Current smokers (%) 57 (36%) 482 (33%) P = 0.42
Disease duration (months) 3.5 (2.7 to 5.0) - -
IgM-rheumatoid factor positive (%) 103 (65%) - -
Anti-CCP positive (%) 93 (58%) - -
Any SE present (%) 116 (73%) - -
  1. Median (inter-quartile range)
  2. Comparison between groups was carried out using Mann-Whitney U-test and Fischers Exact test
  3. Anti-CCP, antibodies against cyclic citrullinated peptides; SE, shared epitopes; RA, rheumatoid arthritis