Table 2.
Validity assessment of the dietary screener, as compared to three-day diet records (n=35)
| Item | Simple kappa | P-value | Number of subjects who reported consumption in records |
|---|---|---|---|
| Beverage frequency (tertiles) | |||
| Regular soda | 0.07 | 0.55 | 23 |
| Diet soda | -- | -- | 2 |
| Sports drinks | -- | -- | 4 |
| Sweetened beverages | 0.08 | 0.50 | 16 |
| Milk | 0.18 | 0.14 | 26 |
| Coffee drinks | -- | -- | 0 |
| Beverage amount | |||
| Regular soda | 0.01 | 0.89 | 23 |
| Diet soda | -- | -- | 2 |
| Water | 0.08 | 0.35 | 33 |
| Fast food (tertiles) | |||
| Overall frequency | 0.08 | 0.53 | 24 |
| Fast food type | |||
| Traditional “burger-and-fries” | -- | -- | 7 |
| Mexican | -- | -- | 2 |
| Fried chicken | -- | -- | 1 |
| Sandwich/subs | -- | -- | 3 |
| Pizza | -- | -- | 2 |
| Asian | -- | -- | 2 |
| Bakery/donut shop | -- | -- | 1 |
| Bagel shop | -- | -- | 0 |
| Coffee shop | -- | -- | 0 |
| Ice cream and burgers | -- | -- | 1 |
| Snack bar | -- | -- | 0 |
Beverage and fast food intake frequencies from both the screener and food record items were divided into tertiles.
Simple Kappas were used to assess validity between screener and food record items. Stable estimates for validity were not possible for diet soda, sports drinks, and coffee and all of the specific fast food types since less than 10 participants reported consuming foods at any of these types of restaurants at least once a day within the three-day period.