Table 1 Area under the curve (AUC) and 95% confidence interval (CI) of ROC curves when ranges of urine osmolality and urinary creatinine measured on a 24-h collection of urine are used to predict the 24 h urine volume and the 24 h intake of water. All calculations were based on 157 urine collections performed during both normal and increased water consumption
Volume (L) | Osmolality 50–400 | Osmolality 50–600 | Osmolality > 800 | Creatinine 2–6 | Creatinine 2–9 | Creatinine > 15 |
|---|---|---|---|---|---|---|
PREDICTION OF URINE VOLUME—analysis of 24 h urine collection | ||||||
AUC (95% CI) | 0.87 (0.82–0.93) | 0.87 (0.81–0.93) | 0.89 (0.81–0.97) | 0.86 (0.80–0.93) | 0.84 (0.78–0.90) | 0.92 (0.82–1.00) |
Pos./neg | 58 / 99 | 115 / 42 | 20 / 137 | 66 / 91 | 96 / 61 | 12 / 145 |
PREDICTION OF WATER INTAKE—analysis of 24-h urine collection | ||||||
AUC (95% CI) | 0.77 (0.70–0.85) | 0.77 (0.69–0.85) | 0.74 (0.63–0.85) | 0.75 (0.67–0.83) | 0.75 (0.67–0.82) | 0.81 (0.71–0.90) |
Pos./neg | 58 / 99 | 115 / 42 | 20 / 137 | 66 / 91 | 96 / 61 | 12 / 145 |