Table 1 Characteristics of mothers by rheumatoid arthritis (RA), systemic lupus erythematosus (SLE) and control status

From: Mother−child histocompatibility and risk of rheumatoid arthritis and systemic lupus erythematosus among mothers

Characteristics

RA

SLE

Controls

Na

138

117

913

Age at interview, mean ± SD

56.0 ± 9.2

56.3 ± 10.7

36.5 ± 9.2

Number of live births, mean ± SD

2.2 ± 1.0

2.4 ± 1.2

1.9 ± 0.9

Number of live births prior to diagnosis, mean ± SD

2.0 ± 1.0

2.2 ± 1.2

—

Years between last birth before diagnosis and diagnosis, mean ± SDb

13.5 ± 11.0

16.1 ± 10.4

—

Age at diagnosis, mean ± SD

39.4 ± 11.6

42.7 ± 10.6

—

  1. aParticipants included in HLA-compatibility analyses
  2. bAge at last birth before diagnosis available for 120 RA cases
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