Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
203	CLINICAL LABORATORY TECHNOLOGISTS AND TECHNICIANS	415	366
446	HEALTH AIDES, EXCEPT NURSING	207	200
449	MAIDS AND HOUSEMEN	659	481
453	JANITORS AND CLEANERS	2,380	1,040
539	MECHANICAL CONTROLS AND VALVE REPAIRERS	2,515
547	SPECIFIED MECHANICS AND REPAIRERS, N.E.C.	718
557	SUPERVISORS; PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	3,250
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	1,964
593	INSULATION WORKERS	311
748	LAUNDERING AND DRY CLEANING MACHINE OPERATORS	29	29
757	SEPARATING, FILTERING, AND CLARIFYING MACHINE OPERATORS	2,594
766	FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD	3
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	554
883	FREIGHT, STOCK, AND MATERIAL MOVERS, HAND, N.E.C.	690
TOTAL		16,289	2,116

*(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.