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Table 1 FFQ estimates and their corresponding biomarkers

From: Use of food frequency questionnaire to assess relationships between dietary habits and cardiovascular risk factors in NESCAV study: validation with biomarkers

 

FFQ estimates

Biomarkers of nutrient status

Food groups

Fruits (g/day)

β-carotene (mg/L)

Vegetables (g/day)

β-carotene (mg/L)

Fruits and vegetables (g/day)

β-carotene (mg/L)

Micro-nutrients

Vitamin B12 (μg)

B12 (pg/ml)

Vitamin B9 (μg)

Serum folates (ng/ml)

Vitamin B9 (μg)

Erythrocyte folates (ng/ml)

Vitamin D (μg)

25-OH Vitamine D (ng/ml)

Vitamin E (mg)

α-tocopherol (mg/L)

Iron (mg)

Iron (μmol/L)

Iron (mg)

Ferritin (ng/ml)

Iron (mg)

Transferrin (g/L)

Iodine (μg)

Iode/Creatinine ratio (μg/g)

β-carotene (μg)

β-carotene (mg/L)

Sodium (mg)

Urine sodium (mmol/L)