BPDAYS is a 3-digit numeric variable with no implied decimals.
0: Not in universe
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, BPDAYS reports the number of days that the person had back pain last year.
This variable was included in the 1988 Occupational Health supplement.
- 1988: Sample persons aged 18+ who worked last year at a civilian job and who had back pain for at least 1 week last year
- 1988 : SUPP2WT