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In Table 1, we show the joint distribution across the categories of years since migration of the parents.
Based on the cluster analysis, four categories of years (C1-C4) were classified as high precipitation, freezing with sufficient precipitation, dry hot, and normal years, respectively.
Table 1 shows that differences among the ethnic groups were found in the categories of years of education (p < 0.05), language proficiency (p < 0.05), loneliness (p < 0.05), and HRQOL (p < 0.05).
These seven categories of years of education were merged into to two broader basic categories, namely illiterate, and literate as descriptive analysis showed that most centenarians were illiterate and only a small proportion of them had high school or university education.
On the other hand, we observed that the correlation between both constructs was different in men and women and in two categories of years of schooling, with the male patients and those patients with higher years of schooling having the stronger correlations.
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Maternal age was studied using categories of <20 years, 20 24 years, 25 29 years, 30 34 years, and 35+ years, with 35+ years as the reference group.
She observed huge differences in median latency periods across categories of year of first exposure to asbestos.
Cohort studies reporting on the association between smoking duration and breast cancer risk found an increased breast cancer risk [ 7– 11, 20], which was significant in four [ 7, 8, 11, 20] out of the six studies for the highest category of years of smoking duration.
25 26 We divided age at retirement into categories of 54 years or under, 55 years, and 56 years or over.
Many studies have used age categories of 0 15 years and > 15 years, which was considered the minimum acceptable age stratification by the expert panel.
Duration between health survey and death was grouped into categories of 3.4 years or less and 3.5 7.1 years to allocate samples equally into groups.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com