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Table 1 Computing annual intake of food items by multiplying average self-reported annual frequency of food intake by unit portion size

From: Association of self-reported consumption of cooked meat, fish, seafood and eggs with prostate cancer risk among Nigerians

Annual Intake Pattern Never Rarely Occasionally Sometimes Frequently Every Day
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
(3 Groups)
Rarely Sometimes Frequently
Annual Intake Mid-Interval Frequency × Unit Portion Size
Annual Intake
(4 Groups)
Transform to Quartiles