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Agreement of quartile assignment between the short FFQ and vitamin D, measured as 25(OH)D in serum.
| Quartile | Same quartile | Adjacent quartile | Misclassified |
|---|---|---|---|
| 1 (n = 12) | 5 | 5 (above) | 2 (above) |
| 2 (n = 17) | 4 | 9 (4 above, 5 below) | 4 (above) |
| 3 (n = 12) | 3 | 7 (4 above, 2 below) | 1 (below) |
| 4 (n = 12) | 4 | 4 (below) | 5 (below) |
| Total number (n = 53) | 16 | 25 | 12 |
| % | 30 | 47 | 23 |
