Table 5.

Characteristics of 1098 SLE cases with ≥ 4 SLE ICD-9 code counts and ANA positive^£.

Current mean age (± standard deviation)	51 ± 17
Mean age at first use of SLE ICD-9 code* (± SD)	40 ± 17
Female % (n)	90% (n = 986)
Caucasian % (n)	65% (n = 715)
African American % (n)	25% (n = 270)
Hispanic % (n)	3% (n = 30)
Asian % (n)	2% (n = 25)
Alaskan/Indian % (n)	0.2% (n = 2)
Missing/Unknown % (n)	5% (n = 56)
Mean number of counts of the SLE ICD-9 code	20 ± 22
Mean years of follow-up	9 ± 5

^*SLE ICD-9 code 710.0

^£ANA ≥ 1:160