Table 1 Characteristics of patients with systemic lupus erythematosus

Female/male

15/0 (100%)

28/5 (84.8%)

21/1 (95.5%)

Ethnicity

   Caucasian

13 (86.7%)

20 (60.6%)

19 (86.4%)

   Black

2

9

3

   Asian

0

4

0

Age at serum sampling (years)

   Median

30

28

35

   Range

19 to 58

17 to 48

20 to 76

Duration of SLE (years) at serum sampling

   Median

6

2.1

10

   Range

0.25 to 36

0.1 to 14.1

1.1 to 49

Duration of follow-up (years) (from SLE diagnosis to last visit)

   Median

13.5

13

19

   Range

5.9 to 23

2 to 17

4 to 52

SLEDAI at first serum sampling (points)

   Median

10^a

8

0

   Range

4–22

4–30

0 to 3