Table 1 Baseline characteristics of estimated urinary sodium excretion quartile group
|  | Total | Q1 (< 3.90 g/d) | Q2 (3.90–4.76 g/d) | Q3 (4.77–5.75 g/d) | Q4 (> 5.75 g/d) | P value |
|---|---|---|---|---|---|---|
N | 6510 | 1628 | 1627 | 1627 | 1628 | Â |
Age (years) | 62.00 [57.00, 66.00] | 61.00 [56.00, 65.00] | 61.00 [57.00, 66.00] | 62.00 [58.00, 67.00] | 63.00 [59.00, 68.00] | < 0.001 |
Male | 2239 (34.4%) | 354 (21.7%) | 482 (29.6%) | 599 (36.8%) | 804 (49.4%) | < 0.001 |
Current smoking | 914 (14.2%) | 162 (10.0%) | 225 (14.1%) | 233 (14.5%) | 294 (18.4%) | < 0.001 |
Current drinking | 674 (10.5%) | 114 (7.1%) | 159 (9.9%) | 160 (9.9%) | 241 (14.9%) | < 0.001 |
BMI (kg/m²) | 25.07 [23.03, 27.29] | 24.12 [22.07, 26.23] | 24.80 [22.92, 26.88] | 25.39 [23.38, 27.50] | 25.99 [23.92, 28.18] | < 0.001 |
Systolic blood pressure (mmHg) | 132.33 [121.33, 143.67] | 128.33 [117.00, 139.67] | 130.67 [120.67, 142.00] | 134.00 [122.67, 145.00] | 136.33 [125.92, 148.00] | < 0.001 |
Diastolic blood pressure (mmHg) | 78.67 [72.33, 85.33] | 76.67 [70.67, 83.67] | 78.67 [72.67, 84.67] | 78.67 [73.00, 85.67] | 80.33 [74.00, 86.33] | < 0.001 |
Heart rate (beats/min) | 76.67 [69.33, 84.67] | 77.33 [70.16, 86.00] | 76.33 [69.00, 84.00] | 76.33 [69.33, 84.33] | 76.67 [69.33, 84.67] | 0.011 |
Hypertension | 3586 (55.1%) | 753 (46.3%) | 850 (52.3%) | 908 (55.8%) | 1050 (66.1%) | < 0.001 |
Diabetes mellitus | 1927 (29.7%) | 398 (24.5%) | 432 (26.6%) | 482 (29.7%) | 615 (37.8%) | < 0.001 |
Hyperlipidemia | 5237 (80.6%) | 1330 (81.7%) | 1315 (81.1%) | 1295 (79.7%) | 1297 (79.8%) | 0.067 |
Cardiovascular disease | 444 (7.0%) | 95 (5.9%) | 83 (5.2%) | 107 (6.7%) | 159 (10.0%) | < 0.001 |
eGFR (ml/min/1.73m2) | 95.22 [87.77, 100.51] | 95.53 [87.81, 100.69] | 95.70 [89.08, 100.95] | 95.18 [87.32, 100.52] | 94.62 [87.33, 99.98] | 0.012 |
Estimated urinary sodium excretion (g/d) | 4.90 ± 1.42 | 3.24 ± 0.53 | 4.34 ± 0.24 | 5.24 ± 0.29 | 6.78 ± 0.96 | < 0.001 |
Spot urinary sodium (mmol/L) | 113.97 ± 48.69 | 82.26 ± 35.79 | 108.43 ± 41.89 | 123.96 ± 45.87 | 141.24 ± 49.65 | < 0.001 |