TABLE 5.
Misclassification of the three estimation methods for individual salt intake
| Salt intake was converted according to the measured 24‐hour urinary sodium excretion rate | |||||
|---|---|---|---|---|---|
| Method/categories | <10 g (N = 81) | 10–11.4 g (N = 80) | 11.5–12.7 g (N = 82) | ≥12.8 g (N = 80) | Total (N = 323) |
| Kawasaki method | |||||
| <10 g | 29 (35.8%) | 19 (23.8%) | 9 (11.0%) | 11 (13.75%) | |
| 10–11.4 g | 30 (37.0%) ) | 32 (40%) | 6 (7.3%) | 3 (3.75%) | |
| 11.5–12.7 g | 21 (25.9%) | 29 (36.2%) | 42 (51.2%) | 2 (2.5%) | |
| ≥12.8 g | 1 (1.3%) | 0 (0%) | 25 (30.5%) | 64 (80%) | |
| Misclassification | 52 (64.2%) | 48 (60%) | 40 (48.8%) | 16 (20%) | 156 (48.2%) |
| Tanaka method | |||||
| <10 g | 74 (91.4%) | 74 (92.5%) | 59 (72%) | 22 (27.5%) | |
| 10–11.4 g | 5 (6.2%) | 4 (5.0%) | 16 (19.5%) | 31 (38.8%) | |
| 11.5–12.7 g | 2 (2.4%) | 2 (2.5%) | 4 (4.9%) | 19 (23.7%) | |
| ≥12.8 g | 0 (0%) | 0 (0%) | 3 (3.6%) | 8 (10%) | |
| Misclassification | 7 (8.6%) | 76 (95%) | 78 (95.1%) | 72 (90%) | 233 (72.1%) |
| INTERSALT method | |||||
| <10 g | 70 (86.4%) | 74 (92.5%) | 76 (92.7%) | 47 (58.8%) | |
| 10–11.4 g | 8 (9.9%) | 5 (6.3%) | 4 (4.9%) | 15 (18.7%) | |
| 11.5–12.7 g | 3 (3.7%) | 1 (1.2%) | 2 (2.4%) | 16 (20%) | |
| ≥12.8 g | 0 (0%) | 0 (0%) | 0 (0%) | 2 (2.5%) | |
| Misclassification | 11 (13.6%) | 75 (93.7%) | 80 (97.6%) | 78 (97.5%) | 244 (75.5%) |
Abbreviation: INTERSALT, International Cooperative Study on Salt, Other Factors, and Blood Pressure.