SIC	Industry Description (1972)	Total # Employees (Male & Female)	Total # Female Employees
28	CHEMICALS AND ALLIED PRODUCTS	1,557	276
45	TRANSPORTATION BY AIR	1,843
72	PERSONAL SERVICES	11,731	8,061
73	BUSINESS SERVICES	93	56
80	HEALTH SERVICES	73	73
TOTAL		15,298	8,466

*(1) By survey design, not all 2-digit SICs were surveyed. (2) The estimates for each 2-digit SIC apply only to the 3- and 4-digit SICs surveyed within the 2-digit SIC. Not all SICs were surveyed. (3) When using the estimates, standard errors associated with estimates should be considered. (4) 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.