Table 4 Logistic regression analysis for the association between cumulative respiratory silica exposure and ventilatory disorders

Using LLN as the cutoff values for FEV1/FVC

Obstructive(LLN)

1.07

(0.98–1.18)

0.133

1.06

(0.99–1.12)

0.09

Restrictive(LLN)

1.21

(0.98–1.50)

0.081

1.05

(0.99–1.11)

0.124

Obstructive(LLN) or restrictive(LLN)

1.27

(1.03–1.56)

0.022

1.04

(1.01–1.09)

0.026

Using 0.75 as the cutoff value for FEV1/FVC

Obstructive(0.75)

1.05

(0.96–1.16)

0.296

1.02

(0.97–1.07)

0.41

Restrictive(0.75)

1.21

(0.98–1.50)

0.081

1.04

(0.99–1.11)

0.124

Obstructive(0.75) or restrictive(0.75)

1.17

(1.01–1.35)

0.031

1.03

(0.99–1.07)

0.096

Using 0.70 as the cutoff value for FEV1/FVC

Obstructive(0.70)

0.99

(0.77–1.28)

0.952

1.14

(0.94–1.37)

0.187

Restrictive(0.70)

1.21

(0.98–1.50)

0.081

1.05

(0.99–1.11)

0.124

Obstructive(0.70) or restrictive(0.70)

1.13

(0.98–1.32)

0.096

1.06

(1.00-1.12)

0.036