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Table 5 Geometric mean biomarker concentration, estimated intake at first dietary recall by myfood24 and interviewer-based tool and intraclass correlation coefficients between biomarker and each tool assessed over three time points

From: Validity of an online 24-h recall tool (myfood24) for dietary assessment in population studies: comparison with biomarkers and standard interviews

 

Biomarker

n = 202

myfood24

n = 208

Interviewer-based 24-h recall

n = 197

Geometric mean (95% CI)

Geometric mean (95% CI)

Intraclass correlation with biomarker

Geometric mean (95% CI)

Intraclass correlation with biomarker

Nutrient intake:

 β-carotene

0.59 μM (0.52, 0.67)

0.65 mg (0.51, 0.83)

0.56 (0.52, 0.60)

1.53 mg (1.20, 1.95)

0.52 (0.48, 0.56)

 Vitamin C

60 μM (57, 64)

59 mg (51, 69)

0.53 (0.50, 0.57)

75 mg (66, 85)

0.53 (0.49, 0.56)

 Vitamin E

37 μM (35, 40)

1.6 mg (1.3, 1.9)

0.55 (0.50, 0.59)

2.3 mg (2.0, 2.8)

0.53 (0.49, 0.57)