Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
446	HEALTH AIDES, EXCEPT NURSING	735	474
448	SUPERVISORS, CLEANING AND BUILDING SERVICE WORKERS	28
453	JANITORS AND CLEANERS	6,646	2,722
505	AUTOMOBILE MECHANICS	1,488
507	BUS, TRUCK, AND STATIONARY ENGINE MECHANICS	343
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	213
686	BUTCHERS AND MEAT CUTTERS	3,501	645
749	MISCELLANEOUS TEXTILE MACHINE OPERATORS	435	300
779	MACHINE OPERATORS, NOT SPECIFIED	26
804	TRUCK DRIVERS, HEAVY	1,029
885	GARAGE AND SERVICE STATION RELATED OCCUPATIONS	2,363
TOTAL		16,806	4,140

*(1) The estimates for each occupation apply across the surveyed industries in which the agent was observed. Not all industries were surveyed, and not all agents were observed in all surveyed industries. (2) When using the estimates, standard errors associated with estimates should be considered. (3) Potential exposures to a chemical agent are categorized as actual (i.e., the surveyor observed the use of the specific agent) or tradename (i.e., the surveyor observed the use of a tradename product known to contain the specific agent). The estimates presented in the table combine both categories.