Table 3 The slope and intercept for bias of each estimation vs. overall mean of 6 estimations
From: Monitoring population salt intake using casual urinary sodium: Tehran Lipid and Glucose Study
Methods of estimation | Linear regression model | Zero difference to overall mean | Difference from overall mean at the low, medium and high salt intake (g/d) | |||
|---|---|---|---|---|---|---|
Slope | Intercept | 5 | 10 | 15 | ||
Kawasaki | 1.14 (1.10, 1.18) | − 7.52 (− 7.91, − 7.12) | 6.6 | − 1.8 | 3.9 | 9.6 |
Tanaka | 0.09 (0.06, 0.18) | − 0.71 (− 1.02,− 0.39) | 7.6 | − 0.2 | 0.2 | 0.7 |
Intersalt | − 0.12 (− 0.15, 0.09) |  + 0.51 (0.25, 0.76) | 4.3 | − 0.1 | − 0.7 | − 1.3 |
Toft | 0.31 (0.27, 0.35) | − 2.09 (− 2.45, − 1.73) | 6.7 | − 0.55 | 1.0 | 2.6 |
Whitton | − 0.63 (− 0.73, − 0.54) |  + 3.28 (2.39, 4.16) | 5.2 | 0.1 | − 3.1 | − 6.2 |
FFQ | − 1.36 (− 1.44, − 1.28) |  + 11.60 (10.88, 12.32) | 8.5 | 4.8 | − 2.0 | − 8.8 |