Element-period

N^a

Confidence interval (−95%)

Confidence interval (+95%)

Median (µg∙m⁻³)

p value^b

K-2004

9

0.9343

1.2324

1.1000

0.09

K-2009

10

1.0270

1.8920

1.5123

Cr-2004

9

^*

0.0184

0.0000

0.57

Cr-2009

10

0.0015

0.0034

0.0024

Ni-2004

9

0.0029

0.0149

0.0100

0.006

Ni-2009

10

0.0008

0.0017

0.0012

Cu-2004

9

0.0044

0.0112

0.0100

0.63

Cu-2009

10

0.0021

0.0171

0.0063

Zn-2004

9

0.0430

0.0592

0.0500

0.003

Zn-2009

10

0.0248

0.0418

0.0324

Pb-2004

9

0.0044

0.0112

0.0100

0.96

Pb-2009

10

0.0042

0.0112

0.0067

S-2004

9

0.4021

0.8535

0.5500

0.53

S-2009

10

0.5093

0.9148

0.6308

Cl-2004

9

0.0904

0.2363

0.1300

0.001

Cl-2009

10

0.0128

0.0617

0.0241