Such occupational threshold limit values (TLV) are often categorized as time-weighted average (TWA), short-term exposure limit (STEL), and ceiling (C) values, with the last defining the exposure limit, which should not be exceeded at any time.
Current techniques for supporting adaptability and evolvability can be categorized as static (happening at compile-time or design-time), or dynamic (adaptation during the actual execution of the system).
The patients' employment status was categorized as paid work (full- or part-time) or no paid work (disability, retired, unemployed).
The patient's employment status was categorized as paid work (full- or part-time) or no paid work (disability, retired, unemployed).
This variable was categorized as 0 times, 1 2 times, 3 4 times, 5 6 times, and more than 6 times based on the response distribution and was treated as an ordinal variable for analysis based on model fit indicators.
Notes: The two bullying-related items were categorized as 2+ times vs. none/one time.
Employment status was categorized as part-time employment, full-time employment, student, retired, disabled, and unemployed.
Donor status was categorized as first time if no previous donations were documented at BSI prior to 2011 and the donor did not return for a second donation during the study period.
Variables are categorized as describing time events, patient response, and device operations and therapy and primary and secondary information objects are indicated by the acronyms PIO and SIO, respectively.
