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. Author manuscript; available in PMC: 2015 Oct 1.
Published in final edited form as: Arthritis Care Res (Hoboken). 2014 Oct;66(10):1438–1446. doi: 10.1002/acr.22366

Table 2.

Characteristics of RA cases (n = 493) who answered the 2008 Nurses’ Health Study questionnaire according to self-reported familial RA or lupus in first-degree relatives (FDR).

RA case characteristics No FDR
(n = 350)		 Any FDR
(n = 143)
Age at RA diagnosis (mean, SD) 58.5 (9.9) 57.9 (10.0)
Age at RA symptoms (mean, SD) 57.7 (10.4) 57.0 (11.0)
Seropositive1, no. (%) 215 (61) 86 (60)
1

Seropositivity was defined as positive rheumatoid factor and/or anti-citrullinated protein antibody.

FDR = first-degree relative; RA = rheumatoid arthritis; SD = standard deviation.