Table 3.

Multiple linear regression analysis results between heavy metals concentration and lichen physiology parameters.

Chlorophyll	Estimate	p value	VIF*
(Intercept)	1.03E + 00	<2e-16
As	1.28E-02	0.003	2.06
Cu	−5.41E-05	0.70	1.44
Mn	−5.04E-05	0.79	2.07
Ni	−9.18E-03	0.0004	2.74
Pb	6.82E-04	0.28	1.27
Zn	9.77E-07	0.99	1.3
Fe	2.99E-06	0.07	2.1
Protein
(Intercept)	52.01	0.04
As	−45.2	0.0001
Cu	−0.44	0.24
Mn	1.05	0.04
Ni	12.19	0.07
Pb	2.05	0.22
Zn	0.12	0.38
Fe	−0.007	0.12
MDA
(Intercept)	1.08E + 02	<2e-16
As	5.91E + 00	0.19
Cu	6.15E-01	0.0001
Mn	9.98E-02	0.62
Ni	−1.92E + 00	0.47
Pb	−2.42E + 00	0.0005
Zn	−1.00E-01	0.08
Fe	4.47E-04	0.8

The heavy metals that showed statistical significance are indicated in bold font.

VIF: variance inflation factor.