Table 1 Computing annual intake of food items by multiplying average self-reported annual frequency of food intake by unit portion size
Annual Intake Pattern | Never | Rarely | Occasionally | Sometimes | Frequently | Every Day (Daily) | Many Times (A Lot) |
|---|---|---|---|---|---|---|---|
Reference | 0/Year | ≤6/Year | 1–2/Month | 1–2/Week | 3–4/Week | 5–7/Week | ≥ 2/Day |
Interval Boundary | 0 |
|
|
|
|
| 365 × 2 |
Mid-Interval Value | 0 | 3 | 18 | 78 | 182 | 312 | 730 |
Frequency (3 Groups) | Rarely | Sometimes | Frequently | ||||
Annual Intake | Mid-Interval Frequency × Unit Portion Size | ||||||
Annual Intake (4 Groups) | Transform to Quartiles | ||||||
