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Table 2 Longitudinal study patient demographics

From: Urinary TWEAK as a biomarker of lupus nephritis: a multicenter cohort study

  AECOM cohort OSS cohort Pvalue
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)  
Ethnicitya 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
rSLEDAIb 4 (0 to 8) 4 (0 to 4)  
World Health Organization classb, 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 visitb 0.8 (0.7 to 1.2) 1.03 (0.8 to 1.5) 0.160
  1. Continuous variables presented as the median (interquartile range). AECOM, Albert Einstein College of Medicine; OSS, Ohio SLE Study; rSLEDAI, renal Systemic Lupus Erythematosus Disease Activity Index. aAfrican American/Hispanic/Caucasian/other.bLupus nephritis patients only. *P < 0.05. Continuous variables were compared by the Mann- Whitney U test, while the two-sample proportion test was used for categorical variables. Statistical comparisons were not performed when values were not independent of each other.