wkst_code	wkst_text
00	N/A
01	At work
02	At work part time
03	At work part time, usually work full time
04	At work part time, usually work part time
05	At work on full time schedules  (only use to distinguish >35 hrs)
07	With a job not at work
08	Usually work full-time schedules (with a job not at work)
09	Usually work part-time schedules (with a job not at work)
19	At work full time
20	At work 35+ hours, usually work part time
21	At work 35+ hours, usually work full time