For our analysis, admissions were categorized by their principal (first) diagnostic code (used to record the main condition responsible for the stay in hospital).
For this analysis, respondents were categorized by deployment history into three groups based on the recency of an operational deployment (never deployed, recent deployment (within the previous two years), and remote deployment (more than two years previously)).
In the analysis, pesticides were categorized by the location where the chemicals were used (i.e., house, lawn, child, pet, or mother's body), by type (i.e., insecticide, herbicide, fungicide, rodenticide), and by combination of location and type (e.g., household insecticide).
After this step, for stratified analysis, continuous variables were categorized by using percentiles as cutoff points [ 29].
In the post hoc sensitivity analysis in which patients were categorized by quarters of delivery of epinephrine there was a stepwise decrease in survival in hospital with increasing quarter: 929 (12%) in the first quarter, 697 (11%) in the second quarter, 543 (10%) in the third quarter, and 434 (8%) in the fourth quarter (P<0.001).
To understand the biological functions of the differentially expressed genes, those that changed ≥2-fold were categorized by GO analysis.
Furthermore, genes associated to the differentially methylated CpG sites were categorized by Gene Ontology analysis using GoMiner software (http://discover.nci.nih.gov/gominer/).
Signal intensity data for the probe sets were categorized by unsupervised analysis using Cluster [ 34] and supervised class prediction with BRB Array Tools [ 35].
However, nearly 1% of sequences were categorized by Blast2Go analysis as comprising external encapsulating structures, defined as any constituent of a structure that lies outside the plasma membrane and surrounds the entire cell [ 25].
For example, Bacteria Cyanobacteria is the longest common prefix of the two taxa Bacteria Cyanobacteria:Prochlorales:Prochlorococcaceae:Prochlorococcus Bacteria Cyanobacteria Chroococcales:Synechococcus The taxonomic identification provided by this analysis was categorized according to the definitions in Bergey's manual, thus enabling a comparison of the metagenomic data using a separate database.
