Comparison of participants by renal function.^a

a<p>Data presented are unweighted means (standard deviation) unless otherwise specified. Kidney disease classified based on estimated glomerular filtration rates (normal > = 90, mild 60–89, moderate 30–59, severe <30 mL/min/1.73 m²). Gout was defined as self-reported physician/provider diagnosis. See <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0050046#s2" target="_blank">methods</a> section for details. Diabetes was defined as fasting glucose >125 or use of anti-diabetic medications. Hypertension was defined as systolic blood pressure >140 mmHg, diastolic blood pressure >90 mmHg or use of blood pressure medications. Blood pressure medications included diuretics. Poverty ratio was the ratio of household income to the Federal poverty levels.