Table 1 Baseline characteristics of evaluated subjects and comparison of positive and negative subjects in the screening test

From: Prevalence of primary aldosteronism among prehypertensive and stage 1 hypertensive subjects

   Screening test
Patient characteristics All subjects Positive Negative
Total patients, n 292 54 238
Age (years) 51.1±7.5 50.1±6.3 51.4±7.8
Gender, female/male 44/248 10/44 34/204
Systolic BP (mm Hg) 146±12 146±12 146±12
Diastolic BP (mm Hg) 95±9 97±9 95±9
Potassium (mEq l–1) 4.27±0.34 4.31±0.32 4.26±0.35
PAC (ng per 100 ml) 10.6±4.2 12.0±4.4 10.3±4.1*
PRA (ng ml–1 h–1) 1.23±1.16 0.42±0.20 1.41±1.21**
ARR 10.4 (6.6–18.0) 27.2 (23.0–35.7) 9.0 (6.2–13.3)**
  1. Abbreviations: ARR, PAC to PRA ratio; BP, blood pressure; PAC, plasma aldosterone concentration; PRA, plasma renin activity.
  2. ARRs are median (interquartile range), other values are means±s.d.
  3. *P<0.01, **P<0.0001, both vs. positive subjects.