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Table 2 Linear regression coefficients (b), standard error of the coefficient (SE(b)) and p-value of the Chow test statistics, comparing two coefficients estimated over two groups, with or without pleural plaques (PP)

From: Osteopontin, asbestos exposure and pleural plaques: a cross-sectional study

Predictor variables §

Without PP (N = 143)

With PP (N = 50)

p-value

 

b

SE(b)

b

SE(b)

 

Age (years)

0.93

0.25

1.05

0.47

0.88

Time since last exposure (years)

0.71

0.24

1.35

0.51

0.52

Time since first exposure (years)

0.94

0.22

1.23

0.44

0.74

Length of exposure (years)

0.45

0.23

- 0.03

0.53

0.95

Cumulative exposure (ff/ml) × years

0.04

0.01

0.01

0.03

0.48

Peak exposure (ff/ml)

0.05

0.03

-0.02

0.05

0.46

Smoking classes

-1.67

2.72

1.16

5.14

0.50

  1. § The dependent variable is Osteopontin in all models of linear regression analysis.