Table 2 Longitudinal study patient demographics

Number of patients (% female)

31 (81)

13 (100)

0.091

Lupus nephritis (%)

58

100

0.005*

Number of visits per patient

3 (2 to 5)

3 (2 to 5)

0.508

Time between visits (months)

3 (2 to 6)

2 (2 to 6)

Ethnicity^a

18/12/0/1

5/0/8/0

African American (%)

58

38

0.235

Age at first visit (years)

36 (31 to 44)

30 (28 to 36)

0.089

rSLEDAI^b

4 (0 to 8)

4 (0 to 4)

World Health Organization class^b, n (%)

   III

6 (33)

1 (8)

0.092

   IV

9 (50)

9 (69)

0.284

   V

2 (11)

3 (23)

0.371

   VI

1 (6)

0 (0)

0.388

Serum creatinine levels

0.8 (0.7 to 1.0)

1.0 (0.8 to 1.6)

   Only lupus nephritis patients

0.9 (0.7 to 1.1)

   At first visit^b

0.8 (0.7 to 1.2)

1.03 (0.8 to 1.5)

0.160