Prevalence of primary aldosteronism in patients according to Sixth Joint National Committee (JNC VI) stages of severity of hypertension (stage 1, 140 to 159/90 to 99 mmHg; stage 2, 160 to 179/100 to 109 mmHg; stage 3, ≥180/110 mmHg) (20). Prevalence of primary aldosteronism in patients according to Sixth Joint National Committee (JNC VI) stages of severity of hypertension (stage 1, 140 to 159/90 to 99 mmHg; stage 2, 160 to 179/100 to 109 mmHg; stage 3, ≥180/110 mmHg) (20). David A. Calhoun CJASN 2006;1:1039-1045 ©2006 by American Society of Nephrology