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. Author manuscript; available in PMC: 2010 Aug 9.
Published in final edited form as: Arthritis Rheum. 2010 Mar;62(3):837–844. doi: 10.1002/art.27267

Table 2.

Within-subject and between-subject variance of the erythrocyte biomarkers in SLE patients, patients with other diseases, and healthy controls*

Lupus biomarker Patients
with SLE
(n = 157)		 Patients
with other
diseases
(n = 290)		 Healthy
controls
(n = 256)
E-C3d
   Grand mean 3.44 1.12 0.71
   Variance within 5.87 3.08 0.47
   Variance between 16.06 0.94 0.45
E-C4d
   Grand mean 16.79 8.23 6.03
   Variance within 86.96 13.80 4.27
   Variance between 217.63 25.3 20.2
*

SLE = systemic lupus erythematosus; E-C3d = erythrocyte-bound C3d.