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Validation Information: INTAKE24

Bradley 2016

Comparison of INTAKE24 (an Online 24-h Dietary Recall Tool) with Interviewer-Led 24-h Recall in 11–24 Year-Old

Online dietary assessment tools offer a convenient, low cost alternative to traditional dietary assessment methods such as weighed records and face-to-face interviewer-led 24-h recalls. INTAKE24 is an online multiple pass 24-h recall tool developed for use with 11-24 year-old. The aim of the study was to undertake a comparison of INTAKE24 (the test method) with interviewer-led multiple pass 24-h recalls (the comparison method) in 180 people aged 11-24 years. Each participant completed both an INTAKE24 24-h recall and an interviewer-led 24-h recall on the same day on four occasions over a one-month period. The daily energy and nutrient intakes reported in INTAKE24 were compared to those reported in the interviewer-led recall. Mean intakes reported using INTAKE24 were similar to the intakes reported in the interviewer-led recall for energy and macronutrients. INTAKE24 was found to underestimate energy intake by 1% on average compared to the interviewer-led recall with the limits of agreement ranging from minus 49% to plus 93%. Mean intakes of all macronutrients and micronutrients (except non-milk extrinsic sugars) were within 4% of the interviewer-led recall. Dietary assessment that utilises technology may offer a viable alternative and be more engaging than paper based methods, particularly for children and young adults.

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Validation Information

Year of Publication

Tool Information

Dietary Exposure Measured
Full Nutrient, Food Groups
Tool Type
24 Hour Recall
Timeframe Tool Measures info
Portion Size Measures info
A series of food photographs are used for portion size estimation.
Reporting Method info
Format info
Supplements Measured
Not Reported
Administration Method info

Study Information

Study Location
Newcastle, England and Dundee, Scotland
Associated Nutrient Database
NDNS databank
Comparator Validated Against
24hr Recall


Sample Size
52 (11-16 years old), 116 (17-24 years old)
Adolescents, Adults
Age of Population

Range: 11-24 years

Other Notable Characteristics
The population represented a range of socio-economic status and ethnicity.

Total number of nutrients validated: 10 info

Not all of the nutrients validated in the validation studies are included in the table below, as statistical data was only selected to be displayed for a number of nutrients, this included:

  • Energy
  • Fat
  • Saturated Fat
  • Mono-unsaturated Fat
  • Poly-unsaturated Fat
  • Carbohydrates
  • Protein
  • Sugar
  • Non‐starch polysaccharides(NSP)
  • Sodium
  • Calcium
  • Iron
  • Zinc
  • Retinol
  • Folate
  • Folic Acid
  • Vitamin B12
  • Vitamin C
  • Fruit & Vegetables
  • Urinary Nitrogen

To find information on the other validated nutrients please read the validation study.

  • Energy
  • Macronutrients: 6
  • Micronutrients: 3
Comparator Lifestage Sex Nutrient Measured info Mean Difference Standard Deviation info Correlation Coefficient info Cohen's Kappa Coefficient Percentage Agreement Percentage Agreement Categories info Lower Limits of Agreement Upper Limits of Agreement
24hr Recall Adolescents Both Energy (kcal) 0.97 (Ratio of Geo) 0.52 (Ratio) 1.82 (Ratio)
Energy (kJ) 0.97 (Ratio of Geo) 0.52 (Ratio) 1.82 (Ratio)
Protein (g) 0.99 (Ratio of Geo) 0.47 (Ratio) 2.11 (Ratio)
Fat (g) 0.92 (Ratio of Geo) 0.43 (Ratio) 1.96 (Ratio)
Saturated fat (g) 0.92 (Ratio of Geo) 0.39 (Ratio) 2.17 (Ratio)
Carbohydrates (g) 0.99 (Ratio of Geo) 0.52 (Ratio) 1.88 (Ratio)
Fibre (NSP) (g) 0.94 (Ratio of Geo) 0.45 (Ratio) 1.98 (Ratio)
Calcium (mg) 1.00 (Ratio of Geo) 0.46 (Ratio) 2.18 (Ratio)
Iron (mg) 0.98 (Ratio of Geo) 0.45 (Ratio) 2.11 (Ratio)
Vitamin C (mg) 1.09 (Ratio of Geo) 0.44 (Ratio) 2.71 (Ratio)
24hr Recall Adults Both Energy (kcal) 1.00 (Ratio of Geo) 0.5 (Ratio) 1.98 (Ratio)
Energy (kJ) 1.00 (Ratio of Geo) 0.5 (Ratio) 1.98 (Ratio)
Protein (g) 1.02 (Ratio of Geo) 0.42 (Ratio) 2.51 (Ratio)
Fat (g) 0.99 (Ratio of Geo) 0.43 (Ratio) 2.32 (Ratio)
Saturated fat (g) 0.99 (Ratio of Geo) 0.38 (Ratio) 2.62 (Ratio)
Carbohydrates (g) 1.02 (Ratio of Geo) 0.52 (Ratio) 2.00 (Ratio)
Fibre (NSP) (g) 1.02 (Ratio of Geo) 0.46 (Ratio) 2.27 (Ratio)
Calcium (mg) 1.03 (Ratio of Geo) 0.42 (Ratio) 2.54 (Ratio)
Iron (mg) 0.99 (Ratio of Geo) 0.44 (Ratio) 2.25 (Ratio)
Vitamin C (mg) 1.03 (Ratio of Geo) 0.18 (Ratio) 5.81 (Ratio)

Some results have been calculated using statistical techniques based on the published data.

For further information on statistical terms click on Statistical tests used in validation studies

All correlations coefficients in the table are unadjusted unless stated otherwise. For adjusted correlation coefficients and other statistical methods used in the study e.g. paired t-tests, please read the validation articles.

  • # Adjusted
  • † Energy adjusted.
  • ‡ For loge-transformed, energy-adjusted nutrient intakes.
  • ^ Adjacent included.
  • ᵟ Participants provided identical responses.
  • (w) = Weighted.

Bradley J, Simpson E, Poliakov I, Matthews JN, Olivier P, Adamson AJ, Foster E. Comparison of INTAKE24 (an online 24-h dietary recall tool) with interviewer-led 24-h recall in 11–24 year-old. Nutrients. 2016 Jun 9;8(6):358.