Table 6. Rank correlation coefficients between inhalable cobalt adjusted for the use of respirators and cobalt in blood, urine and on skin.

	Inhalable cobalt	Skin cobalt	Urine cobalt
Blood cobalt	0.40**	0.36**	0.44**
Inhalable cobalt	-	0.26*	0.25**
Skin cobalt	-	-	0.17

*: Correlation is significant at the 0.05 level (two-tailed)

**: Correlation is significant at the 0.01 level (two-tailed)