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Cross-classification (%) of vitamin D intake into quartiles by the WRH-FFQ and validation methods (average of three 24 h recalls and biomarker, i.e. plasma 25-hydroxyvitamin D (25(OH)D)) for twenty participants, Serbian women of reproductive age, November 2010–April 2011
| Vitamin D intake assessed by FFQ | |||
|---|---|---|---|
| Vitamin D intake assessed by | Same quartile | Same or adjacent quartile | Opposite quartile |
| 24 h recalls | 65 | 80 | 20 |
| 25(OH)D | 50 | 80 | 20 |
WRH-FFQ, Women and Reproductive Health FFQ.
