Table 2.
Urine osmolality and the urinary creatinine concentration measured in spot samples for increasing daily intakes of water. Data are the mean (SD)
| Water intake 24 h (L) |
U-osmolality (mosmol/kg) |
U-creatinine (mmol/L) |
Spot samples (N) | Volunteers contributing samples (N) |
Sample per volunteer (N) |
Meals (N) |
Spot sample per meal (N) |
|---|---|---|---|---|---|---|---|
| 0.9–1.5 | 853 (237) | 14.2 (6.2) | 27 | 4 | 6.8 | 41 | 0.66 |
| 1.5–2.0 | 582 (270) | 10.1 (6.6) | 79 | 8 | 9.9 | 101 | 0.78 |
| 2.0–2.5 | 549 (252) | 9.7 (6.2) | 134 | 12 | 11.2 | 174 | 0.77 |
| 2.5–3.0 | 545 (251) | 8.5 (5.8) | 203 | 15 | 13.5 | 258 | 0.79 |
| 3.0–3.5 | 479 (242) | 7.4 (5.0) | 111 | 13 | 8.5 | 129 | 0.86 |
| 3.5–5.0 | 390 (228) | 6.7 (5.3) | 141 | 14 | 10.1 | 181 | 0.78 |
| 5.0–6.9 | 233 (117) | 3.0 (2.7) | 67 | 10 | 6.7 | 77 | 0.87 |