. Author manuscript; available in PMC: 2011 Apr 1.

Published in final edited form as: Occup Environ Med. 2010 Oct 25;68(4):250–256. doi: 10.1136/oem.2010.056077

Table 2.

Spearman correlation coefficients for age and cadmium and lead biomarkers in 712 current and former lead workers

Current workers Age ≤ 44.8 years mineral	Urine cadmium μg/g	Blood lead μg/dL	Tibia lead μg/ g bone
Age	0.34^#	0.04	0.13^*
Urine cadmium		0.19^**	0.12
Blood lead			0.45^#

Current workers Age > 44.8 years mineral	Urine cadmium μg/g	Blood lead μg/dL	Tibia lead μg/ g bone
Age	0.17^**	0.17^**	0.19^**
Urine cadmium		−0.02	−0.07
Blood lead			0.66^#

Former workers mineral	Urine cadmium μg/g	Blood lead μg/dL	Tibia lead μg/ g bone
Age	0.33^#	0.21^**	0.40^#
Urine cadmium		−0.001	0.07
Blood lead			0.61^#

p-value < 0.05

^**

p-value < 0.01

p-value < 0.001