Table 3. Exposure concentration levels of inhalable cobalt by job title, adjusted for the use of respirators.

	Inhalable cobalt (mg/m3)
Job title	n	AM	Median	SD	GM	GSD	Min	Max
Forming/prototype	5	0.00094	0.00061	0.00050	0.00084	1.6	0.00058	0.0017
Lab	5	0.00060	0.00037	0.00048	0.00046	2.3	0.00020	0.0013
Maintenance	7	0.00089	0.00078	0.00056	0.00073	2.1	0.00022	0.0018
Powder	15	0.0022	0.00090	0.0030	0.00084	4.5	0.00010	0.0092
Pressing	39	0.0019	0.0011	0.0023	0.0011	2.8	0.00016	0.010
Total	71	0.0017	0.00090	0.0022	0.00092	3.0	0.00010	0.010

n: number of measurements; AM: arithmetic mean; SD: standard deviation; GM: geometric mean; GSD: geometric standard deviation