Table 2.

Spearman rank correlations between estimated TRAP concentrations, averaged over 3 y prior to participants’ ($n=\mathrm{6,061}$) analytic baseline in the Chicago Health and Aging Project (1999–2012).

	${\mathrm{NO}}_{\mathrm{X}}$	${\mathrm{NO}}_2$	${\mathrm{PM}}_{2.5–10,\mathrm{Cu}}$	${\mathrm{PM}}_{2.5–10,\mathrm{Zn}}$
${\mathrm{NO}}_{\mathrm{X}}$	1.00	0.91	0.63	$-0.10$
${\mathrm{NO}}_2$	0.91	1.00	0.71	$-0.13$
${\mathrm{PM}}_{2.5–10,\mathrm{Cu}}$	0.63	0.71	1.00	$-0.18$
${\mathrm{PM}}_{2.5–10,\mathrm{Zn}}$	$-0.10$	$-0.13$	$-0.18$	1.00

Note: PM, particulate matter; TRAP, traffic-related air pollution.