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Table 2 Age and sex of the early rheumatoid arthritis group and comparison groupsa

From: Clinical correlations with Porphyromonas gingivalis antibody responses in patients with early rheumatoid arthritis

    Patients
Demographic categories Age-similar
hospital
personnel
( N = 19)
Blood bank donors
( N = 53)
Systemic
lupus erythematosus
( N = 17)
Other
CTD
( N = 17)
Early
RA
( N = 50)
Late
RA
( N = 43)
Age,
mean (range)b
48 (36 to 80) N/A 44 (25 to 59) 50 (27 to 88) 53 (30 to 80) 60 (21 to 85)
Sex,
females/malesc
7/12 N/A 17/17 15/17 36/14 31/12
  1. aCTD: connective tissue disease; N/A: not available; RA: rheumatoid arthritis. bFor comparison of age in early RA group vs. late RA group, P = 0.01; for early RA vs. systemic lupus erythematosus, P = 0.003. There were no other significant differences in age among the groups. cRegarding sex distribution, healthy hospital personnel, who were primarily men, were significantly different from each of the patient groups, which were composed primarily of women (P ≤ 0.01). The members of the lupus group, which was exclusively female, were significantly different than both RA patient groups (P < 0.05).