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Table 4 Summary of the multivariate regression coefficients of 15 factors for COPD

From: Effects of regional air pollutants on respiratory diseases in the basin metropolitan area of central Taiwan

Coefficients

Urban

Suburban

Rural

Constant coefficient, α0

-0.05

0.01

0.02

Air quality aspect

 PM2.5, β1

2.56

0.17

-0.16

 ODO, β2

-*

0.08

-0.27

 NMHC, β3

-0.55

0.07

-0.14

Point source aspect

 PM2.5, γ1

1.98

-5.12

1.04

 NOx, γ2

-

5.01

-0.92

 NMHC, γ3

-1.47

-0.21

-0.67

Line source aspect

 PM2.5, δ1

-

-9.90

-4.46

 NOx, δ2

-

4.82

3.36

 NMHC, δ3

-

7.44

1.07

Area source aspect

 PM2.5, 𝜉1

-2.49

0.30

0.52

 NOx, 𝜉2

1.64

-2.89

-0.72

 NMHC, 𝜉3

-0.43

0.19

-0.10

Social economics aspect

 Population density, 𝜆1

-1.14

-0.39

-0.02

 Salary, 𝜆2

-0.39

0.09

0.22

 Medical manpower, 𝜆3

0.03

0.18

0.10

 R-squared

1

0.901

0.753

 p-values

-**

0.003

0.063

  1. * An independent variable that was excluded by SPSS statistical estimation when R2 = 1
  2. ** The p-value approaches zero