Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
075	GEOLOGISTS AND GEODESISTS	28
078	BIOLOGICAL AND LIFE SCIENTISTS	345	315
083	MEDICAL SCIENTISTS	195	142
203	CLINICAL LABORATORY TECHNOLOGISTS AND TECHNICIANS	4,112	3,448
223	BIOLOGICAL TECHNICIANS	151	109
224	CHEMICAL TECHNICIANS	95	63
446	HEALTH AIDES, EXCEPT NURSING	162	68
453	JANITORS AND CLEANERS	221
TOTAL		5,307	4,146

*(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.