Table 3.
Adequacy of the 24-hour urinary collection using the current reference values and the new prediction model, in the whole SKIPOGH population and in the elderly patients
| Classification according to current reference values | Classification according to the new prediction model a | Percentage of reclassified samples | ||
|---|---|---|---|---|
| Incomplete | Adequate | Overcollected | ||
| (<10th centile) | (10th to 90th cent) | (>90th centile) | ||
| Whole population | 44.2% | |||
| Incomplete | 57 | 247 | 1b | |
| Adequate | 1 | 406 | 10 | |
| Overcollected | 0 | 180 | 92 | |
| Older population (age >60 years) | 59.9% | |||
| Incomplete | 8 | 141 | 1b | |
| Adequate | 0 | 84 | 10 | |
| Overcollected | 0 | 2 | 11 | |
aThe selection of 10th to 90th as cut-off is arbitrary and should be interpreted as an example of application of the prediction equation; bthis observation is from a 90-year-old woman with 24-hour urinary creatinine of 132 μmol/kg/24 hours and BMI 23.8 kg/m2. Values represent number of people. Current reference values for adequate 24-hour urinary collection: 177 to 221 μmol/kg (20 to 25 mg/kg) in men and 133 to 177 μmol/kg (15 to 20 mg/kg) in women.