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Table 1 Definition of the regrouped food frequency categories for data analysis based on original categories obtained from the child's diet questionnaire

From: Cured meat, vegetables, and bean-curd foods in relation to childhood acute leukemia risk: A population based case-control study

Food group New categries for data analysis
  Rare or occasional consumption Frequent consumption
Cured meat/fish Never; few times/year;< 4/month 1–2/week; 3–4/week; > = 5/week
Pickled vegetables Never; few times/year < 4/month; 1–2/week; 3–4/week; > = 5/week
Bean-curd foods Never; few times/year < 4/month; 1–2/week; 3–4/week; > = 5/week
Vegetables < 1/week; 1/week; 2–3/week; 5–6/week few times/day
Fruits < 1/week; 1/week; 2–3/week; 5–6/week few times/day