Validation Information: Supermarket Sales Data (New Zealand)
Eyles 2010
Use of Household Supermarket Sales Data to Estimate Nutrient Intakes: A Comparison with Repeat 24-Hour Dietary Recalls
Electronic supermarket sales data provide a promising, novel way of estimating nutrient intakes. However, little is known about how these data reflect the nutrients consumed by an individual household member. A cross-sectional survey of 49 primary household shoppers (age [mean+/-standard deviation age]=48+/-14 years; 84% female) from Wellington, New Zealand, was undertaken. Three months of baseline electronic supermarket sales data were compared with individual dietary intakes estimated from four random 24-hour dietary recalls collected during the same 3-month period. Spearman rank correlations between household purchases and individual intakes ranged from 0.54 for percentage of energy from saturated fat (P=0.001) to 0.06 for sodium (P=0.68). Other correlation coefficients were: percentage of energy from carbohydrate, 0.48; and protein, 0.44; energy density of nonbeverages, 0.37 (kcal/oz); percentage of energy from total fat, 0.34; sugar, 0.33 (oz/kcal); and energy density of beverages, 0.09 (oz/kcal; all P values <0.05). This research suggests that household electronic supermarket sales data may be a useful surrogate measure of some nutrient intakes of individuals, particularly percentage of energy from saturated and total fat. In the case of a supermarket intervention, an effect on household sales of percentage energy from saturated and total fat is also likely to impact the saturated and total fat intake of individual household members.
Total number of nutrients validated: 6
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: 7
- Micronutrients: 0
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 24hr Recall | Adults | Both | Energy density (kcal/oz) | -49.36 | 69.43 | 0.37 (S) | N/C | N/C | |||
| Protein (% from energy) | 4 | 5 | 0.44 (S) | N/C | N/C | ||||||
| Fat (% from energy) | -1 | 8 | 0.34 (S) | N/C | N/C | ||||||
| Saturated Fat (% from energy) | -1 | 4 | 0.54 (S) | N/C | N/C | ||||||
| Carbohydrate (% from energy) | -3 | 7 | 0.48 (S) | N/C | N/C | ||||||
| Sugar (oz/kcal) | -2.10 | 6.07 | 0.33 (S) | N/C | N/C | ||||||
| Sodium (oz/kcal) | 122.84 | 164.98 | 0.06 (S) | N/C | N/C |
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.
Eyles H, Jiang Y, Mhurchu CN. Use of household supermarket sales data to estimate nutrient intakes: a comparison with repeat 24-hour dietary recalls. Journal of the American Dietetic Association. 2010 Jan 31;110(1):106-10.