Table 1 Demographic and clinical characteristics of patients by age category
Non-AKI | AKI | |||||||
|---|---|---|---|---|---|---|---|---|
Characteristic | 18–64 years (n = 92391) | 65–79 years (n = 28934) | ≥80 year (n = 8061) | P value | 18–64 years (n = 9104) | 65–79 years (n = 4030) | ≥80 year (n = 1712) | P value |
Age (yr) | 46.55 ± 12.43 | 71.33 ± 4.32 | 84.14 ± 3.64 | <0.001 | 47.41 ± 12.34 | 71.76 ± 4.39 | 84.54 ± 3.71 | <0.001 |
Male (%) | 52.7 | 59.1 | 61.9 | <0.001 | 59.5 | 60.7 | 61.1 | 0.25 |
Geographic location (%) | <0.001 | <0.001 | ||||||
Northern | 26.1 | 27.9 | 25.1 | 28 | 28.2 | 25.3 | ||
Central | 34 | 29.7 | 32.8 | 28.8 | 28.9 | 34.6 | ||
Southern | 39.9 | 42.3 | 42.1 | 43.2 | 42.9 | 40.1 | ||
CKD (%) | 3.2 | 12.5 | 26.1 | <0.001 | 17.4 | 31.7 | 42.5 | <0.001 |
Charlson comorbidity index | 1.17 ± 1.32 | 1.56 ± 1.46 | 1.87 ± 1.65 | <0.001 | 1.35 ± 1.44 | 1.92 ± 1.65 | 2.28 ± 1.8 | <0.001 |
BaselineSCr (umol/L) | 66.16 ± 23.49 | 76.82 ± 27.19 | 84.91 ± 29.44 | <0.001 | 77.33 ± 41.48 | 84.26 ± 40.52 | 87.26 ± 36.18 | <0.001 |
Peak SCr (umol/L) | — | — | — | — | 180.1 ± 177.35 | 190.29 ± 170.84 | 198.31 ± 167.49 | <0.001 |
No. of SCr tests | 3.43 ± 2.48 | 3.4 ± 2.43 | 3.62 ± 2.96 | <0.001 | 7.81 ± 8.11 | 7.65 ± 7.52 | 9.14 ± 13.44 | <0.001 |
Frequency of SCr testa | 0.39 ± 0.23 | 0.43 ± 0.26 | 0.43 ± 0.26 | <0.001 | 0.49 ± 0.26 | 0.5 ± 0.27 | 0.53 ± 0.27 | <0.001 |
AKI Subtypes (%)b | — | <0.001 | ||||||
CA-AKI | — | — | — | 2.76 | 3.89 | 6.58 | ||
HA-AKI | — | — | — | 8.78 | 11.55 | 15.64 | ||
AKI stage (%) | — | <0.001 | ||||||
1 | — | — | — | 56.6 | 60.7 | 59.4 | ||
2 | — | — | — | 20.1 | 20.4 | 21.2 | ||
3 | — | — | — | 23.3 | 18.9 | 19.4 | ||
ICU (%) | 8.1 | 8.8 | 9.2 | <0.001 | 31.3 | 31.7 | 29.2 | 0.19 |