Validation Information: WDDRs
Matsuzaki 2017
Validity of Nutrient Intakes Derived from an Internet Website Dish-Based Dietary Record for Self-Management of Weight among Japanese Women
This artical compared the relative validity of nutrient intakes derived from Internet website dish-based dietary records (WDDRs) and weighed dietary records (DRs). The study participants were 218 registered users of a dietary management website. After excluding 55 participants, a total of 163 participants were included in the final analyses. The participants were Japanese women, and their mean age and mean body mass index (BMI) were 39.3 (+/-10.3) years and 22.3 (+/-3.7) years, respectively. We compared differences in the DR and WDDR with respect to intakes of energy and 13 nutrients. The median values for the intake of protein and seven nutrients showed no significant difference between the DR and WDDR, and the estimated values were generally similar. The interquartile range of nutrients with a significant difference did not show a large deviation, with the exception of vitamin A. Correlation coefficients showed a strong correlation of 0.7, with the exception of sodium and vitamin E. The kappa coefficients for energy and for some nutrients were good to fair. Using Bland-Altman plots, we found proportional errors in the intake values for vitamins and minerals. We could not confirm obvious systematic errors for energy, protein, fat, or carbohydrate intake. WDDR use is considered to be a valid method for estimating energy and nutrient intakes among Japanese women.
Total number of nutrients validated: 13
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: 8
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Weighed Food Diary | Adults | Female Only | Energy (kcal) | 82 (Median) | 0.87 (S) | 0.70 (w) | 66.3 | 4 | |||
| Protein (g) | -0.4 (Median) | 0.78 (S) | 0.53 (w) | 51.5 | 4 | ||||||
| Fat (g) | -0.2 (Median) | 0.75 (S) | 0.52 (w) | 51.5 | 4 | ||||||
| Carbohydrates (g) | 8 (Median) | 0.82 (S) | 0.55 (w) | 50.9 | 4 | ||||||
| Sodium (mg) | 0.4 (Median) | 0.59 (S) | 0.34 (w) | 41.1 | 4 | ||||||
| Calcium (mg) | 4 (Median) | 0.77 (S) | 0.61 (w) | 57.1 | 4 | ||||||
| Iron (mg) | 0 (Median) | 0.81 (S) | 0.64 (w) | 58.9 | 4 | ||||||
| Vitamin C (mg) | -7 (Median) | 0.81 (S) | 0.62 (w) | 58.3 | 4 |
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.
Matsuzaki E, Michie M, Kawabata T. Validity of Nutrient Intakes Derived from an Internet Website Dish-Based Dietary Record for Self-Management of Weight among Japanese Women. Nutrients. 2017;9(10):24.