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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)