Table 1.

Characteristics of individuals with an antinuclear antibody test

Characteristics	ANA tested cohort (n = 70,043)	ANA positive (n = 26,579)	ANA negative (n = 43,464)
Female (%)	48,051 (68.6%)	20,755 (78.1%)	27,296 (62.8%)
White race (%)a	52,475 (74.9%)	19,857 (74.7%)	32,618 (75%)
Year of birth	1963 [1951, 1977]	1962 [1950, 1976]	1963 [1952, 1978]
Age at testing (years)	48.4 [34.5, 59.7]	49.9 [35.9, 61.3]	47.5 [33.7, 58.6]
Length of FU (years)	7.09 [1.88, 13.10]	7.23 [1.92, 13.04]	7.01 [1.85, 13.14]

ANA Antinuclear antibodies, FU Follow-up

^aRace recorded as white in the electronic heath record (EHR). Data are shown as counts (percentage) for categorical variables and median [interquartile range] for continuous variables