Table 1.
Reliability of BP, Dietary Nutrient Intake, and Urinary Electrolyte Excretion Measurements by Country
| Variable | Japan (n=1145) |
People’s Republic of China (n=839) |
United Kingdom (n=501) |
United States (n=2195) |
All (n=4680) |
|---|---|---|---|---|---|
| SBP, mm Hg | 94.9 | 94.5 | 94.4 | 94.0 | 94.3 |
| DBP, mm Hg | 93.7 | 92.6 | 92.8 | 92.9 | 93.0 |
| Linoleic acid, % kcal | 48.6 | 75.2 | 58.8 | 55.5 | 56.5 |
| Total PFA, % kcal | 44.1 | 72.0 | 57.1 | 55.7 | 54.6 |
| Total SFA, % kcal | 64.0 | 70.1 | 73.6 | 67.9 | 67.8 |
| 7-d alcohol, g/24 h | 89.7 | 89.5 | 87.3 | 87.5 | 88.4 |
| Cholesterol, mg/1000 kcal | 43.8 | 58.0 | 41.1 | 54.1 | 50.1 |
| Calcium, mg/1000 kcal | 70.5 | 54.7 | 72.6 | 74.5 | 68.9 |
| Phosphorus, mg/1000 kcal | 66.4 | 83.5 | 76.1 | 70.5 | 72.0 |
| Urinary sodium, mmol/24 h | 63.3 | 72.9 | 56.7 | 59.2 | 62.0 |
| Urinary potassium, mmol/24 h | 74.5 | 64.0 | 67.3 | 76.8 | 72.5 |
Values are estimates of the size of an observed coefficient as a percentage of the theoretical coefficient in a univariate regression analysis.