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Table 3 Attenuation factors, correlation between dietary assessment tool and true intake and mean difference between self-report tool and reference intake for protein, potassium, sodium and total sugar intake and density as assessed by myfood24 and interviewer-based 24-h recall

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

  Dietary assessment tool Attenuation factor (95% CI) Correlation with true intake (95% CI) Mean % difference vs reference tool (95% CI)
Nutrient intake:
 Protein (g) (n = 192) myfood24 0.30 (0.21, 0.38) 0.43 (0.32, 0.53) +1% (−4%, + 7%)
MPRb 0.38 (0.29, 0.47) 0.48 (0.39, 0.58) + 11% (+ 6%, + 17%)
 Potassium (g) (n = 192) myfood24 0.31 (0.21, 0.41) 0.40 (0.28, 0.52) + 26% (+ 19%, + 35%)
MPR 0.35 (0.23, 0.46) 0.38 (0.27, 0.49) + 48% (+ 39%, + 57%)
 Sodium (g) (n = 192) myfood24 0.21 (0.12, 0.30) 0.30 (0.18, 0.41) + 22% (+ 13%, + 32%)
MPR 0.22 (0.11, 0.32) 0.28 (0.15, 0.40) + 28% (+ 18%, + 38%)
 Total sugars (g) (n = 191) myfood24 0.15 (0.06, 0.24) 0.24 (0.09, 0.38) −45% (− 39%, − 50%)
MPR 0.25 (0.14, 0.36) 0.31 (0.18, 0.44) −30% (−24%, − 35%)
Energy expenditure:
 Total energy expenditure (MJ) (n = 185) myfood24 0.19 (0.10, 0.29) 0.29 (0.15, 0.42) −31% (− 27%, − 35%)
MPR 0.32 (0.21, 0.43) 0.37 (0.25, 0.49) −23% (− 19%, − 27%)
Nutrient density:a
 Protein (g/MJ) (n = 180) myfood24 0.16 (0.03, 0.29) 0.17 (0.03, 0.32) + 48% (+ 39%, + 58%)
MPR 0.26 (0.11, 0.40) 0.24 (0.11, 0.37) + 46% (+ 38%, + 55%)
 Potassium (g/MJ) (n = 180) myfood24 0.25 (0.09, 0.41) 0.23 (0.09, 0.37) + 85% (+ 72%, + 99%)
MPR 0.38 (0.23, 0.53) 0.34 (0.22, 0.47) + 93% (+ 81%, + 107%)
 Sodium (g/MJ) (n = 180) myfood24 0.08 (−0.03, 0.19) 0.09 (−0.04, 0.21) + 78% (+ 63%, + 94%)
MPR 0.11 (−0.02, 0.24) 0.11 (− 0.02, 0.24) + 66% (+ 52%, + 80%)
 Total sugars (g/MJ) (n = 179) myfood24 0.16 (0.04, 0.28) 0.21 (0.06, 0.36) −19% (− 11%, − 26%)
MPR 0.23 (0.09, 0.37) 0.25 (0.10, 0.39) −8% (+ 0%, − 15%)
  1. All dietary measures and estimates were log-transformed
  2. aNutrient density for protein, potassium, sodium and total sugars was expressed in g/MJ of total energy intake
  3. bInterviewer-based multiple-pass 24-h dietary recall