Table 2.
Kidney function parameters.
| All patientsa(n = 665) | Urea-to-creatinine ratiob | |||
|---|---|---|---|---|
| < 61 (n = 221) | 61–84 (n = 223) | > 84 (n = 221) | ||
| Pre-existent kidney function | ||||
| Creatinine (µmol/L) | 87 (84–91) | 92 (87–97) A | 88 (82–95) B | 82 (77–88) B |
| Urea (mmol/L) | 6.4 (6.2–6.7) | 5.6 (5.1–6.2) A | 6.1 (5.8–6.6) A | 7.3 (6.8–8.1) B |
| Urea-to-creatinine ratio | 71 (69–74) | 57 (54–59) A | 69 (67–73) B | 89 (86–94) C |
| Kidney function upon presentation | ||||
| Creatinine (µmol/L) | 91 (88–95) | 98 (91–109) A | 92 (85–97) B | 83 (79–92) B |
| Relative change in creatinine | 1.03 (1.01–1.05) | 1.05 (1.00–1.07) | 1.02 (1.00–1.05) | 1.02 (1.00–1.05) |
| Urea (mmol/L) | 6.9 (6.6–7.4) | 5.0 (4.8–5.5) A | 6.6 (6.3–7.4) A | 8.8 (8.2–9.4) B |
| Relative change in urea | 1.05 (1.01–1.07) | 0.91 (0.89–0.96) A | 1.07 (1.04–1.13) B | 1.15 (1.08–1.22) C |
| Urea-to-creatinine ratio | 72 (70–75) | 53 (51–54) A | 72 (71–74) B | 103 (100–105) C |
| Kidney function at discharge | ||||
| Creatinine (µmol/L) | 83 (81–88) | 89 (83–94) A | 84 (81–91) B | 79 (74–87) B |
| Urea (mmol/L) | 5.6 (5.4–6.1) | 4.5 (4.3–5.0) A | 5.6 (5.4–6.4) B | 6.6 (6.4–7.4) B |
| Urea-to-creatinine ratio | 66 (63–68) | 50 (49–52) A | 68 (66–70) B | 88 (85–93) C |
aData are presented as n (%) for categorical variables or median (95%CI) for continuous variables. Different letters in superscript represent significant differences between groups (p < 0.05).
bThe urea-to-creatinine ratio was calculated by dividing the serum urea (mmol/L) by the serum creatinine (µmol/L). To convert the presented urea-to-creatinine ratio in SI-units to conventional units (i.e. BUN and serum creatinine in mg/dL) divide the presented ratio by four.