Table 6 Mediation effects of air pollutants on the association between greenness (SAVI250) and hearing thresholds.

From: Effect of green space in the workplace on hearing thresholds in noise exposed population

Outcome

Mediator

Direct effect a;

P Value

Indirect effect a;

P Value

Total effect a;

P Value

Left

 

NO2

− 1.945 (− 2.961,− 0.957)

<0.001

− 0.219 (− 0.934,0.327)

0.390

− 2.165 (− 2.998,− 1.269)

< 0.001

 

PM2.5

− 1.811 (− 2.845,− 0.799)

<0.001

− 0.351 (− 1.224,0.204)

0.228

− 2.163 (− 3.106,− 1.193) <0.001

 

PM10

− 2.138 (− 3.077,− 1.106)

<0.001

− 0.026 (− 0.600,0.462)

0.928

− 2.164 (− 3.003,1.224)

< 0.001

 

SO2

− 2.207 (− 2.942,− 1.381)

<0.001

0.048 (− 0.343,0.567)

0.816

− 2.159 (− 2.961,1.225)

<0.001

 

O3

− 2.176 (− 3.135,− 1.248)

 < 0.001

0.012 (− 0.410, 0.484)

0.974

− 2.164 (− 2.995,− 1.238)

 < 0.001

Right

 

NO2

− 2.343 (− 3.970,− 0.714)

0.002

0.085 (− 0.650,0.998)

0.820

− 2.257 (− 3.663,− 0.783)

<0.001

 

PM2.5

− 2.194 (− 3.828,− 0.590)

 < 0.001

− 0.068 (− 0.821,0.654)

0.804

− 2.262 (− 3.594,− 0.855)

 < 0.001

 

PM10

− 2.358 (− 3.779,− 0.723)

0.002

0.111 (− 0.547,0.845)

0.718

− 2.247 (− 3.573,− 0.762)

0.002

 

SO2

− 2.290 (− 3.489,− 0.969)

<0.001

0.044 (− 0.399,0.622)

0.864

− 2.245 (− 3.494,− 0.886)

0.006

 

O3

− 2.167 (− 3.674,− 0.663)

< 0.001

− 0.088 (− 0.709,0.442)

0.692

− 2.256 (− 3.613,− 0.808)

< 0.001

  1. All regression models were estimated with cluster-robust standard errors at the workplace level to account for potential intra-cluster dependence.
  2. aEffects were presented as the β coefficient and 95% confidence interval per unit increment in greenness indexes.
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