Table 2. .
Summary Statistics for Covariates Studied
| Covariatea | Nb | Mean | SD | Median | Interquartile Range |
| Serum biochemistry: | |||||
| Sodium (mmol/liter) | 3,062 | 138.53 | 3.06 | 139.00 | 137.00–140.00 |
| Chloride (mmol/liter) | 3,062 | 102.03 | 3.13 | 102.00 | 100.00–104.00 |
| Urea (mmol/liter) | 3,082 | 6.07 | 1.71 | 5.90 | 5.00–6.90 |
| Creatinine (μmol/liter) | 3,083 | 89.56 | 20.47 | 87.00 | 77.00–99.00 |
| Calcium (mmol/liter) | 3,079 | 2.43 | .13 | 2.43 | 2.35–2.51 |
| Corrected calcium (mmol/liter) | 3,082 | 2.34 | .13 | 2.34 | 2.27–2.41 |
| Albumin (g/liter) | 3,071 | 44.47 | 2.84 | 44.00 | 43.00–46.00 |
| GGT (U/liter) | 3,071 | 34.44 | 30.75 | 26.00 | 19.00–38.00 |
| Urate (mmol/liter) | 3,071 | .31 | .08 | .31 | .26–.37 |
| Total cholesterol (mmol/liter) | 3,138 | 5.58 | 1.01 | 5.52 | 4.90–6.20 |
| Tryglyceride (mmol/liter) | 3,138 | 2.13 | 1.34 | 1.80 | 1.29–2.57 |
| HDL cholesterol (mmol/liter) | 3,138 | 1.36 | .37 | 1.32 | 1.11–1.58 |
| GFR (ml/min per 1.73 m2) | 3,070 | 72.29 | 14.23 | 72.19 | 63.19–81.01 |
| Urine biochemistry: | |||||
| Sodium (24-h excretion) (mmol) | 2,453 | 84.26 | 36.27 | 78.00 | 58.00–105.00 |
| Potassium (24-h excretion) (mmol) | 2,453 | 41.61 | 16.27 | 39.00 | 31.00–49.00 |
| Creatinine (24-h excretion) (mmol) | 2,452 | 6.39 | 3.03 | 5.60 | 4.30–7.80 |
| Sodium concentration (mmol/liter) | 2,440 | 141.33 | 59.89 | 132.60 | 100.30–172.65 |
| Potassium concentration (mmol/liter) | 2,439 | 69.90 | 26.65 | 67.60 | 52.50–83.70 |
| Creatinine concentration (mmol/liter) | 2,439 | 10.39 | 3.86 | 9.69 | 7.80–12.48 |
| Creatinine clearance (ml/min) | 2,308 | 82.33 | 29.80 | 79.17 | 63.33–96.81 |
| Albumin (mg/liter) | 2,452 | 13.73 | 68.47 | 5.00 | 3.00–8.00 |
| Sodium/potassium ratio | 2,453 | 2.16 | .96 | 2.00 | 1.53–2.61 |
| Urinary albumin/serum creatinine ratio (mg/mmol) | 2,450 | 4.95 | 20.86 | 1.56 | .90–3.11 |
| Biometric measurements: | |||||
| Triceps (cm) | 2,831 | 18.84 | 8.77 | 18.00 | 12.00–25.00 |
| Biceps (cm) | 2,930 | 14.65 | 7.46 | 13.00 | 9.00–20.00 |
| Subscapular (cm) | 2,827 | 19.28 | 6.48 | 19.00 | 15.00–23.00 |
| Suprailiac (cm) | 2,886 | 18.91 | 6.45 | 18.00 | 14.00–23.00 |
| Height (m) | 3,250 | 1.66 | .09 | 1.65 | 1.59–1.72 |
| Weight (kg) | 3,244 | 76.13 | 13.40 | 75.08 | 66.50–85.00 |
| BMI | 3,240 | 27.61 | 3.93 | 27.00 | 25.00–30.00 |
| Mean waist (cm) | 3,070 | 90.60 | 11.63 | 91.00 | 82.00–99.00 |
| Mean hip (cm) | 3,069 | 103.83 | 8.26 | 103.70 | 98.20–109.00 |
| Waist/hip ratio | 3,069 | .87 | .09 | .87 | .80–.94 |
| Pulse and blood pressure measurements: | |||||
| Pulse (beats/min) | 3,250 | 68.44 | 11.93 | 68.00 | 60.00–76.00 |
| SBP at phenotyping (mm Hg) | 3,254 | 155.85 | 21.15 | 154.00 | 141.00–169.00 |
| DBP at phenotyping (mm Hg) | 3,254 | 93.56 | 11.39 | 93.00 | 86.00–101.00 |
| SBP at diagnosis (mm Hg) | 3,101 | 172.42 | 18.36 | 170.00 | 160.00–180.00 |
| DBP at diagnosis (mm Hg) | 3,101 | 104.57 | 8.83 | 103.00 | 100.00–110.00 |
a
GGT = γ-glutamyl transpeptidase; SBP = systolic blood pressure; DBP = diastolic blood pressure.
b
Number of observations.