Table 2

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

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


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).

Arvikar et al. Arthritis Research & Therapy 2013 15:R109   doi:10.1186/ar4289

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