Table 1 Baseline characteristics of the study participants
| Â | Total | Serum albumin | P value | |||
|---|---|---|---|---|---|---|
Q4 (≥ 41.3 g/L) | Q3 (38.9–41.2 g/L) | Q2 (36.2–38.9 g/L) | Q1 (< 36.2 g/L) | |||
Age(year), median(IQR) | 102 (101–104) | 102 (101–104) | 102 (101–105) | 102 (101–105) | 102 (101–105) | 0.026 |
Female, n(%) | 822 (82.0) | 203 (84.2) | 213 (83.5) | 197 (79.1) | 209 (81.3) | 0.440 |
Han ethnicity, n(%) | 883 (88.1) | 213 (88.4) | 217 (85.1) | 225 (90.4) | 228 (88.7) | 0.318 |
Widowed, n(%) | 836 (83.4) | 199 (82.6) | 220 (86.3) | 208 (83.5) | 209 (81.3) | 0.485 |
Illiterate, n(%) | 915 (91.3) | 217 (90.0) | 236 (92.5) | 223 (89.6) | 239 (93.0) | 0.762 |
Never smoking, n(%) | 896 (89.4) | 215 (89.2) | 232 (91.0) | 223 (89.6) | 226 (87.9) | 0.736 |
Never alcohol drinking, n(%) | 836 (83.4) | 201 (83.4) | 217 (85.1) | 212 (85.1) | 206 (80.2) | 0.386 |
ADL disability, n(%) | 140 (14.0) | 7 (2.9) | 29 (11.4) | 26 (10.4) | 78 (30.4) |  < 0.001 |
Hypertension, n(%) | 744 (74.3) | 202 (83.8) | 199 (78.0) | 176 (70.7) | 167 (65.0) |  < 0.001 |
Diabetes, n(%) | 96 (9.6) | 29 (12.0) | 17 (6.7) | 23 (9.2) | 27 (10.5) | 0.216 |
CHD, n(%) | 41 (4.1) | 13 (5.4) | 11 (4.3) | 10 (4.0) | 7 (2.7) | 0.512 |
Stroke, n(%) | 22 (2.2) | 5 (2.1) | 7 (2.7) | 9 (3.6) | 1 (0.4) | 0.085 |
Dyslipidemia, n(%) | 230 (23.0) | 59 (24.5) | 52 (20.4) | 55 (22.1) | 64(24.9) |  < 0.001 |
BMI(kg/m2), mean ± SD | 18.04 ± 3.41 | 18.46 ± 3.24 | 18.13 ± 3.25 | 18.27 ± 3.20 | 17.33 ± 3.79 | 0.001 |
SBP(mmHg), mean ± SD | 152.57 ± 24.43 | 159.90 ± 24.85 | 154.99 ± 22.46 | 151.51 ± 24.59 | 144.31 ± 23.29 |  < 0.001 |
DBP(mmHg), mean ± SD | 75.75 ± 12.94 | 79.99 ± 14.02 | 77.09 ± 11.37 | 74.62 ± 12.13 | 71.53 ± 12.72 | 0.001 |
CRP (mg/L), median (IQR) | 0.19 (0.08–0.43) | 0.13 (0.05–0.30) | 0.19 (0.09–0.33) | 0.17 (0.07–0.40) | 0.33 (0.14–0.99) |  < 0.001 |
Haemoglobin (g/L), mean ± SD | 113.05 ± 16.35 | 120.73 ± 15.44 | 115.73 ± 13.69 | 112.17 ± 15.30 | 104.04 ± 16.27 |  < 0.001 |
FBG(mmol/L), median(IQR) | 4.82 (4.26–5.64) | 4.82 (4.20–5.25) | 4.82 (4.32–5.62) | 4.82 (4.23–5.67) | 4.97 (4.27–5.85) | 0.225 |
eGFR(mL/min/1.73 m2), median (IQR) | 76.42 (48.62–100.96) | 80.87 (47.99–103.46) | 76.42 (49.82–97.74) | 71.52 (46.88–99.78) | 77.72 (49.32–101.18) | 0.724 |
Total protein (g/L), mean ± SD | 68.65 ± 6.27 | 73.00 ± 5.88 | 69.65 ± 5.18 | 67.62 ± 4.90 | 64.73 ± 5.87 |  < 0.001 |
ALT (UI/L), median(IQR) | 9.20 (7.20–12.00) | 10.00 (8.20–12.95) | 9.40 (7.70–11.80) | 8.50 (7.10–12.35) | 8.20 (6.40–10.85) | 0.086 |
AST (UI/L), median(IQR) | 20.60 (17.50–24.40) | 21.50 (18.90–25.65) | 20.70 (17.95–24.60) | 20.20 (17.40–23.60) | 19.40 (16.60–23.90) | 0.396 |