These indicators are categorized according to domain of application: structure, process or outcome of headache care.
All of the selected indicators are categorized into four groups based on origin and removal efficiency by chlorination in DWTP: Group A (municipal, effective): sulfamethoxazole Group B (veterinary, effective): sulfamethazine Group C (municipal, ineffective): caffeine and carbamazepine Group D (veterinary, ineffective): dimetridazole and metronidazole).
The data values for each proxy indicator were categorized using natural breaks (by Jenks algorithm for transport-associated fomites and wild boar, and manual natural breaks for the illegal pathway), and were consequently converted into six scores (scores from 0 to 5).
Each extracted indicator was categorized into a broader domain reflecting a group of health services.
The created socioeconomic indicator was categorized in quartiles that were named as very low, low, intermediate and high according to their socioeconomic score.
This survey resulted in a list of 79 possible indicators, which were categorized into five domains as described in the 'participants and methods' section.
To adjust for the lack of independence between members of the same household, logistic-binomial regression for random effects was used.[ 18] As well, the indicator bacteria were categorized into three strata to investigate patterns of risk with respect to the degree of contamination.
For classes of pesticides, indicators of exposure were categorized according to tertiles.
The 593 nurses (31.6% response rate) who responded identified 70 individual anxiety indicators and 61 anxiety management strategies that were categorized into four and three major categories, respectively.
