TABLE 3.
Intraindividual variability in urinary measures as assessed by mean and median coefficients of variation and Spearman’s rank-order correlations, by gender, International Study of Macronutrients and Blood Pressure, 1996–2002
| Variable | Mean CV* (%) |
Median CV (%) |
Rank-order correlation |
|||
|---|---|---|---|---|---|---|
| Men | Women | Men | Women | Men | Women | |
| All participants (2,357 men, 2,321 women) | ||||||
| 24-hour albumin excretion | 61.7 | 60.2 | 48.7 | 49.7 | 0.644 | 0.609 |
| Albumin:creatinine ratio | 62.0 | 60.8 | 49.2 | 49.6 | 0.658 | 0.604 |
| Albumin concentration | 59.6 | 57.7 | 47.1 | 45.2 | 0.624 | 0.562 |
| Sodium level | 23.7 | 23.0 | 19.1 | 18.7 | 0.483 | 0.548 |
| Potassium level | 18.0 | 18.1 | 14.4 | 14.7 | 0.690 | 0.637 |
| Sodium:potassium ratio | 23.0 | 23.6 | 19.4 | 19.5 | 0.687 | 0.663 |
| Urea level | 15.5 | 15.4 | 12.5 | 12.5 | 0.593 | 0.553 |
| Creatinine level | 9.9 | 9.1 | 6.1 | 5.7 | 0.762 | 0.765 |
| Urinary volume | 20.0 | 18.0 | 16.5 | 14.8 | 0.620 | 0.707 |
| Albumin concentration ≥1.0 mg/liter (850 men, 1,083 women) | ||||||
| 24-hour albumin excretion | 35.7 | 39.1 | 28.4 | 30.7 | 0.695 | 0.533 |
| Albumin:creatinine ratio | 35.2 | 40.0 | 28.0 | 31.2 | 0.699 | 0.516 |
| Albumin concentration | 34.0 | 36.6 | 26.2 | 28.2 | 0.700 | 0.522 |
| Albumin excretion <30 mg and albumin concentration ≥1.0 mg/liter (726 men, 983 women) | ||||||
| 24-hour albumin excretion | 34.8 | 36.7 | 27.8 | 29.4 | 0.531 | 0.455 |
| Albumin:creatinine ratio | 34.3 | 37.6 | 27.4 | 30.0 | 0.541 | 0.442 |
| Albumin concentration | 32.8 | 33.9 | 25.3 | 26.1 | 0.546 | 0.457 |
| Albumin excretion 30–299 mg (102 men, 102 women) | ||||||
| 24-hour albumin excretion | 46.0 | 78.2 | 39.4 | 78.4 | 0.339 | −0.381 |
| Albumin:creatinine ratio | 46.5 | 79.8 | 39.3 | 81.3 | 0.377 | −0.320 |
| Albumin concentration | 47.8 | 78.9 | 42.4 | 77.6 | 0.427 | −0.236 |
*
CV, coefficient of variation.