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Table 4 Associations between night rMSSD and individual PM2.5 metal exposures

From: PM2.5 metal exposures and nocturnal heart rate variability: a panel study of boilermaker construction workers

 

Model 1

Model 2

 

Metal

Metal

Particulate

 

β1

95% CI

β1

95% CI

β2

95% CI

Al

-0.642**

(-1.07, -0.209)

-0.138

(-2.22, 1.95)

-0.004

(-0.022, 0.013)

Cr

-12.54*

(-29.38, 4.30)

3.40

(-19.22, 26.02)

-0.006*

(-0.014, 0.001)

Cu

-0.294

(-1.38, 0.786)

0.093

(-0.613, 0.799)

-0.006**

(-0.010, -0.001)

Fe

-0.013**

(-0.023, -0.002)

-0.002

(-0.032, 0.028)

-0.005

(-0.016, 0.007)

Mn

-0.130**

(-0.162, -0.098)

-0.145*

(-0.348, 0.058)

0.001

(-0.009, 0.010)

Ni

-4.76

(-24.69, 15.16)

1.03

(-11.10, 13.16)

-0.006**

(-0.010, -0.001)

Pb

-11.90

(-38.72, 14.92)

-0.545

(-23.61, 22.53)

-0.005**

(-0.010, -0.0004)

Zn

-0.108

(-1.06, 0.849)

0.105

(-0.625, 0.834)

-0.006**

(-0.011, -0.001)

  1. Model 1: mixed effects linear regression models for each individual metal, adjusted for baseline night rMSSD and smoking status. Model 2: mixed effects linear regression models with each individual metal and PM2.5, adjusted for baseline night rMSSD and smoking status. Regression coefficients (β) are expressed as change in msec of night rMSSD per 1 μg/m3 increase in exposure after adjusting for baseline HRV, smoking status and with or without adjustment for total PM2.5. *p < 0.10 **p < 0.05
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Environmental Health

ISSN: 1476-069X