Table 3

Spearman correlation coefficients within and between PM2.5 metal exposures and total PM2.5 exposure

Al
 Cr
 Cu
 Fe
 Mn
 Ni
 Pb
 Zn
PM2.5
 0.91
 0.91
 0.84
 0.97
 0.95
 0.63
 0.70
 0.53
Al
 1.00
 0.91
 0.67
 0.82
 0.89
 0.40
 0.66
 0.50
Cr
1.00
 0.74
 0.85
 0.85
 0.52
 0.73
 0.48
Cu

1.00
 0.86
 0.73
 0.82
 0.64
 0.56
Fe


1.00
 0.91
 0.69
 0.65
 0.50
Mn



1.00
 0.55
 0.63
 0.46
Ni




1.00
 0.49
 0.40
Pb





1.00
 0.50

Cavallari et al. Environmental Health 2008 7:36   doi:10.1186/1476-069X-7-36