Table 1 Characteristics of participants in the development and internal validation datasets
Variable | Development dataset (N = 1075) | Internal validation dataset (N = 877) | P value |
|---|---|---|---|
Age (year) | 55.6 ± 14.5 | 57.4 ± 13.4 | 0.008 |
Male sex, N (%) | 616 (57.3) | 517 (59.0) | 0.5 |
Body mass index (kg/m2) | 24.0 ± 3.6 | 24.5 ± 3.8 | 0.005 |
Serum creatinine (mg/dL)* | 1.5 ± 1.3 | 1.3 ± 0.9 | < 0.001 |
Serum cystatin C (mg/L) | 1.5 ± 0.9 | 1.3 ± 0.7 | < 0.001 |
Blood urea nitrogen (mg/dL) | 20.9 ± 13.5 | 21.5 ± 11.7 | 0.3 |
Albumin (g/dL) | 3.9 ± 0.5 | 3.9 ± 0.5 | 0.3 |
Uric acid (mg/dL) | 6.7 ± 2.1 | 7.1 ± 2.2 | < 0.001 |
Hemoglobin (g/L) | 12.3 ± 2.3 | 12.7 ± 2.1 | < 0.001 |
Measured GFR (mL/min/1.73 m2) | 71.0 ± 27.4 | 68.8 ± 27.1 | 0.08 |
Measured GFR N(%) | 0.04 | ||
< 30 mL/min/1.73 m2 | 70 (6.5) | 55 (6.3) | |
30–59 mL/min/1.73 m2 | 310 (28.8) | 304 (34.7) | |
60–89 mL/min/1.73 m2 | 420 (39.1) | 324 (36.9) | |
≥ 90 mL/min/1.73 m2 | 275 (25.6) | 194 (22.1) | |