Table 2. Descriptive data on observation time, glomerular filtration rate, 24-hour urine volume and anuria.
| EARLY | LATE | P value | TOTAL | |
|---|---|---|---|---|
| n = 79 | n = 72 | early vs late | n = 151 | |
| OBSERVATION TIME WITH AVAILABLE URINE COLLECTIONS | ||||
| Total observation time (in years) | 2.5 (1.2–3.1) | 2.7 (1.9–3.0) | 0.3 | 2.6 (1.5–3.0) |
| Observation time pre dialysis initiation (in years) | 0.3 (0.1–0.8) | 0.9 (0.5–1.6) | <0.001 | 0.6 (0.2–1.2) |
| Observation time post dialysis initiation (in years) | 1.7 (0.8–2.7) | 1.5 (0.8–1.9) | 0.05 | 1.6 (0.8–2.2) |
| GFR | ||||
| GFR at start of observation time (mL/min/1.73m2) | 10.3 (8.1–13.0) | 9.9 (7.9–12.7) | 0.6 | 9.9 (8.0–12.9) |
| GFR at dialysis initiation (mL/min/1.73m2) | 7.8 (6.2–10.3) | 6.1 (4.9–7.6) | <0.001 | 6.7 (5.5–9.4) |
| 24-HOUR URINE VOLUME | ||||
| Urine volume at start of observation time (in L) | 1.95 (1.63–2.53) | 2.06 (1.70–2.72) | 0.3 | 1.98 (1.66–2.63) |
| Urine volume at dialysis initiation (in L) | 1.75 (1.36–2.14) | 1.77 (1.26–2.22) | 0.8 | 1.75 (1.30–2.18) |
| ANURIA | ||||
| Number of patients who became anuric (%) | 26 (33%) | 23 (32%) | 0.9 | 49 (32%) |
| Time to anuria from start of observation time (in years) | 2.5 (1.4–3.0) | 2.5 (1.7–2.7) | 0.9 | 2.5 (1.5–2.7) |
| Time to anuria from dialysis initiation (in years) | 1.7 (1.2–2.3) | 1.7 (1.0–2.2) | 0.5 | 1.7 (1.2–2.2) |
GFR = glomerular filtration rate, calculated as mean of creatinine and urea clearances from a 24-hour urine collection, corrected for body surface area.
Values are expressed as median (interquartile range) if not indicated otherwise.