Last week, the city also raised their drought level to the highest category, Level 4, which describes "extremely dry conditions".
However, in regard to its skewed distribution, O3 was additionally analyzed as categorical variable in the same models, using the 10 classrooms with lowest level as reference category, the 10 next classrooms as middle category (level 1), and the other 14 classroom with the highest O3 levels as the highest category (level 2).
The highest category of ferritin levels was independently associated with a 1.73 higher presence of metabolic syndrome when compared to the lowest category.
23 Functional ambulation categories categorise the patient's walking ability in six levels (0 5, highest category best).
RR values were also elevated in the two highest categories of average PM10 levels, and remained elevated after adjustment for average benzene concentration (Table 2).
The level of evidence was pooled into two categories: the high level category that included the 1a to 2c categories (mainly randomized clinical trials or cohort studies) and the low level that included the 3 to 5 categories (mainly case-control studies, series of cases, cases and expert opinions).
a reference category = male gender; b reference category = high education level; c reference category = less than modal (< 2400 euro per month); d reference category = comorbidity of both anxiety and depressive disorders.
Tone is a unique feature of Chinese and Mandarin Chinese tones can be classified into five categories: high level, rising, falling-rising, falling, and neutral (Cheng, 1991).
Staining was classified into one of four categories: high level of staining (approx. 90 100% of cells staining, score = 3), medium level of staining (25 90%, score = 2), low level of staining (1 25%, score = 1) and virtually no staining (<1%, score = 0).
Among the 206 cases where the responsible disinfectant's U.S. Environmental Protection Agency toxicity category was known, 80% were in category I (highest toxicity level).
This is probably due to differences in the high-category prevalences (9 vs 14%) resulting in a more extreme group of users in the high category for the 'level of consumption', hence establishing a stronger dose response.
