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

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

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

ISSN: 1471-2407