Validation Information: R24W
Lafreniere 2018
Assessing the relative validity of a new, web-based, self-administered 24 h dietary recall in a French-Canadian population
Objectives: To assess the relative validity of a new, web-based, self-administered 24 h dietary recall, the R24W, for assessment of energy and nutrient intakes among French Canadians.
Design: Each participant completed a 3d food record (FR) and the R24W on three occasions over a 4-week period. Intakes of energy and of twenty-four selected nutrients assessed by both methods were compared.
Setting: Quebec City metropolitan area.
Subjects: Fifty-seven women and fifty men (mean (sd) age: 47.2 (13.3) years).
Results: Equivalent proportions of under-reporters were found with the R24W (15.0%) and the FR (23.4%). Mean (sd) energy intake from the R24W was 7.2% higher than that from the FR (10 857 (3184) kJ/d (2595 (761) kcal/d) v. 10 075 (2971) kJ/d (2408 (710) kcal/d); P<0.01). Significant differences in mean nutrient intakes between the R24W and the FR ranged from -54.8% (i.e. lower value with R24W) for niacin to +40.0% (i.e. higher value with R24W) for alcohol. Sex- and energy-adjusted deattenuated correlations between the two methods were significant for all nutrients except Zn (range: 0.35-0.72; P<0.01). Cross-classification demonstrated that 40.0% of participants were classified in the same quartile with both methods, while 40.0% were classified in the adjacent quartile and only 3.6% were grossly misclassified (1st v. 4th quartile). Analysis of Bland-Altman plots revealed proportional bias between the two assessment methods for 8/24 nutrients.
Conclusion: These data suggest that the R24W presents an acceptable relative validity as compared with the FR for estimating usual dietary intakes in a cohort of French Canadians
Total number of nutrients validated: 23
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: 5
- Micronutrients: 18
| Comparator | Lifestage | Sex | Nutrient Measured | Mean Difference | Standard Deviation | Correlation Coefficient | Cohen's Kappa Coefficient | Percentage Agreement | Percentage Agreement Categories | Lower Limits of Agreement | Upper Limits of Agreement |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Food Diary Estimated | Adults | Both | Energy (kcal) | 187 | 101 | 0.57 (ICC) | 0.35 (w) | 83.2 | 5 | -15 | 389 |
| Energy (kJ) | 782 | 421 | 0.57 (ICC) | 0.35 (w) | 83.2 | 5 | -60 | 1624 | |||
| Protein (g) | 5 | 33 | 0.61 (ICC) | 0.47 (w) | 88.8 | 5 | -61 | 71 | |||
| Fat (g) | 10 | 6 | 0.54 (ICC) | 0.40 (w) | 82.2 | 5 | -2 | 22 | |||
| Saturated Fat (g) | 5 | 2 | 0.58 (ICC) | 0.34 (w) | 83.2 | 5 | 1 | 9 | |||
| Carbohydrates (g) | 13 | 11 | 0.53 (ICC) | 0.35 (w) | 84.1 | 5 | -9 | 35 | |||
| Fiber (g) | -2 | 1 | 0.47 (ICC) | 0.40 (w) | 85 | 5 | -4 | 0 | |||
| Sodium (mg) | 301 | 153 | 0.55 (ICC) | 0.40 (w) | 80.4 | 5 | -5 | 607 | |||
| Calcium (mg) | 164 | 58 | 0.53 (ICC) | 0.37 (w) | 84.1 | 5 | 48 | 280 | |||
| Iron (mg) | 1 | 0.7 | 0.34 (ICC) | 0.28 (w) | 78.5 | 5 | -0.4 | 2.4 | |||
| Zinc (mg) | 1 | 0.6 | 0.38 (ICC) | 0.20 (w) | 72 | 5 | -0.2 | 2.2 | |||
| Folic acid (μg) | -15.9 | 18.2 | 0.33 (ICC) | 0.26 (w) | 74.8 | 5 | -52.3 | 20.5 | |||
| Vitamin B12 (µg) | 0.5 | 0.6 | 0.28 (ICC) | 0.29 (w) | 80.4 | 5 | -0.7 | 1.7 | |||
| Vitamin C (mg) | -43 | 11 | 0.61 (ICC) | 0.37 (w) | 81.3 | 5 | -65 | -21 |
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.
Lafreniere J, Laramee C, Robitaille J, Lamarche B, Lemieux S. Assessing the relative validity of a new, web-based, self-administered 24 h dietary recall in a French-Canadian population. Public Health Nutrition. 2018;21(15):2744-52.