Table 4

Squared partial correlation coefficients

HRV and BP parameters
Independent variables
Adjusted β
Partial R2 (%)
p-value

VLF (ms2) §
Mercury §
-0.06
0.43
0.38

WC
-0.02
10.17
<0.0001

HDL-cholesterol
-0.34
5.52
0.004
LF (ms2)§
Mercury §
-0.006
0.003
0.94

HOMA-IR
-0.22
2.66
0.0178

Age
-0.03
6.15
0.0069
HF (ms2)§
Mercury §
-0.01
0.01
0.88

HOMA-IR§
-0.19
1.80
0.0466

WC
-0.01
2.34
0.0102

Gender
0.39
4.17
0.0011
LF/HF §
Mercury §
0.01
0.001
0.97

Age
-0.05
6.32
0.0002

Gender
-1.19
11.05
<0.0001
NN (ms)
Mercury §
-5.75
0.12
0.61

Age
4.63
8.66
<0.00010

HOMA-IR§
-37.63
5.01
.0028
SDNN (ms)§
Mercury §
-0.056
1.25
0.10

HOMA-IR§
-0.12
7.95
0.0001
SDANN (ms)§
Mercury §
-0.086
1.86
0.026
rMSSD (ms)§
Mercury §
-0.03
0.29
0.395

HDL
-0.10
1.66
0.0488

WC
-0.01
3.69
0.0008
pNN50 (%) §
Mercury §
-0.09
0.28
0.43

HDL
-0.36
1.88
0.032

WC
-0.03
3.99
0.0006
CVRR (%) §
Mercury §
-0.057
1.66
0.056
SBP (mm Hg)
Mercury §
4.77
4.14
0.01

Selenium §
-6.45
2.92
< 0.0001

WC
0.29
7.03
0.0357

Age
0.59
11.27
< 0.0001
DBP (mm Hg)
Mercury §
1.99
1.57
0.087

Triglycerides §
4.76
6.68
< 0.0001
PP (mm Hg)
Mercury §
3.40
4.76
0.0036

WC
0.12
2.83
0.0083

Age
0.68
27.92
< 0.0001

In this table, we present only the confounding factors that explain a significant proportion of the variance. § Log-transformed variables; HOMA-IR: Homeostasis model assessment; WC: Waist circumference.

Valera et al. Environmental Health 2008 7:29   doi:10.1186/1476-069X-7-29