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We also categorized data for CMD LPR >25, deeming it an early warning sign of metabolic distress [ 21, 22].
Poisson regression requires categorized data for rates, unlike the Cox regression models used to fit the linear RR and log RR models here.
The use of such pre-diagnostic and categorized data for the purpose of detecting disease outbreaks is sometimes known as syndromic surveillance.
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Thus categorized data was used for analysis.
Once the data were categorized, the individual responses and the associated categorized data were exported for subsequent data analysis.
We compared a difference between baseline characteristics of patients and after randomization into the two groups with a chi-square test for categorized data and with Student's t test for continuous variables.
In further analysis, differences between the pre-menopausal and post-menopausal groups were tested by unpaired t-test for the normally distributed variables, or the Mann-Whitney U test for non-normally distributed variables, and Chi-square test for categorized data.
This coincidence is rather low, except for grade II of set A. Table 5 presents the results of pairwise agreement analysis for uncategorized and categorized data using Kendall's tau-b for intraobserver variability.
However, in both age groups, the highest body mass index after age 21 years was lower in cases than in controls (the median highest body mass index was 23.9 kg/m2 for cases and 25.0 kg/m2 for controls); categorized data are presented in Table 2.
Among women who breastfed, there was no difference between cases and controls in duration of breastfeeding (mean durations: 12.2 ± 1.2 months for cases, 12.8 ± 1.3 months for controls; categorized data presented in Table 2).
Statistical analysis was done, using the χ2-test for all categorized data.
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