SLE phenotype status by cohort.

See http://www.rheumatology.org/publications/classification/SLE/sle.asp for phenotype definitions. See Table 1 cohort definitions. Global exact test for association between phenotype status and cohort membership. †Historical presence of positive anti-dsDNA test. ‡Presence of end-stage renal disease or histopathologic evidence of severe, progressive renal disease on renal biopsy.