. Author manuscript; available in PMC: 2015 Nov 1.

Published in final edited form as: J Expo Sci Environ Epidemiol. 2014 Apr 16;24(6):622–628. doi: 10.1038/jes.2014.22

Table 2.

Within- and between-subject variance components for airborne and urinary concentrations of nickel and chromium, overall and by plant.

Agent	Plant	Air			Urine
Agent	Plant	Within-subject variance	Between-subject variance	ICC	Within-subject variance	Between-subject variance	ICC
Nickel	1	0.775	0.273	0.260	0.922	<0.001	<0.001
	2	0.638	0.704	0.525	1.07	<0.001	<0.001
	3	0.715	0.233	0.246	0.837	<0.001	<0.001
	Overall	0.718	0.940	0.566	0.984	<0.001	<0.001
Chromium	4	0.544	<0.001	<0.001	0.700	<0.001	<0.001
	5	0.642	0.538	0.456	0.926	<0.001	<0.001
	6	0.445	0.349	0.440	0.457	0.163	0.263
	Overall	0.566	0.400	0.414	0.763	<0.001	<0.001

ICC, intraclass correlation coefficient (between-subject variance/(between-subject variance+within-subject variance)