BPCLASSWK
Class of worker at the time the accident that caused back pain happened
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For sample persons aged 18 and older who worked last year at a civilian job and who had back pain every day for at least 1 week last year as a result of an accident or injury at work, BPCLASSWK reports the person's class of employment at the time of the accident.
This variable was included in the 1988 Occupational Health supplement.