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We categorized education as: high school or less (≤ 12 years of educational attainment); some college (13 15 years); and college or postgraduate (≥ 16 years).
We categorized education of the mother as no high school (< 9 years of educational attainment), some high school (9 12 years of educational attainment); some college (13 15 years); and college or postgraduate (≥ 16 years).
We categorized education resource allocation as 1 = key class of key school; 2 = ordinary class of key school; 3 = key class of ordinary school; 4 = ordinary class of ordinary school.
We categorized age into five groups 60-644, 65-69, 70-74, 75-79, and 80 years and older) to allow for non-linear relationships, and categorized education level, recorded as highest grade attained, into three groups (0-8, 9-12, and 13-17 years). 13-17 years
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We categorized educational level into higher education (>12 years) or not.
Education was categorized as: no education, primary education, secondary education, above secondary and other education (mosque and church).
Education: categorized as high education – secondary school graduation or more; low education – less than secondary school graduation.
We categorized age, education, work status, and household density (residents/room).
To test for trends across continuous predictors, we categorized income, education, years in the United States (among the foreign-born), and fish consumption variables into four ordinal levels (scored 1 4); we used age in continuous form.
SES variables were categorized into education: primary, vocational, secondary, and university; household monthly income per capita: ≤500 PLN, 501 1,000 PLN, 1,001 1,500 PLN, and >1,500 PLN; number of children in the family: one, two, three, four, or more; and dwelling: rural, urban.
In order to increase comparability between countries and data sources, educational levels were categorized as 'lower education' (no or primary education and lower secondary education) and 'higher education' (upper secondary education, and post-secondary/tertiary education).
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