Association between the Type of Workplace and Lung Function in Copper Miners
Table 3
Association between type of workplace and lung function after 10, 20, and 25 years of professional work. Multiple linear regressions adjusted for age, height, weight, BMI, smoking, and coexistence of respiratory disease.
After 10 years
After 20 years
After 25 years
Workplace
Level compared
FVC -coefficient (95% CI)
FVC -coefficient (95% CI)
FVC -coefficient (95% CI)
Group
Welders
0
0
0
Operators
−0,06 (−0,13 to 0,01)
0,17 (−0,18 to 0,52)
−0,09 (−0,21 to 0,03)
Others
0.06 (−0.01 to 0.13)
−0,56 (−0,90 to −0,22)
0,21 (−0,33 to −0,08)
p value
0.08
0,0022
0,0012
Workplace
Level compared
FEV1 -coefficient (95% CI)
FEV1 -coefficient (95% CI)
FEV1 -coefficient (95% CI)
Group
Welders
0
0
0
Operators
−0,04 (−0,12 to 0,02)
0,23 (−0,10 to 0,57)
−0,04 (−0,24 to 0,008)
Others
0,05 (−0,012 to 0,13)
−0,63 (−0,95 to −0,30)
−0,12 (−0,95 to −0,30)
p value
0,17
0,0004
0,0667
Workplace
Level compared
FEV1/FVC -coefficient (95% CI)
FEV1/FVC -coefficient (95% CI)
FEV1/FVC -coefficient (95% CI)
Group
Welders
0
0
0
Operators
0,02 (−0,06 to 0,09)
0,19 (−0,24 to 0,64)
0,04 (0,09 to −0,17)
Others
−0,005 (−0,08 to 0,06)
−0,01 (−0,43 to 0,41)
0,09 (−0,03 to 0,22)
p value
0,61
0,37
0,14
Workplace
Level compared
PEF -coefficient (95% CI)
PEF -coefficient (95% CI)
PEF -coefficient (95% CI)
Group
Welders
0
0
0
Operators
−0,001 (−0,08 to 0,07)
0,02 (−0,36 to 0,40)
0,004 (−0,12 to 0,13)
Others
0,04 (−0,03 to 0,11)
−0,31 (−0,68 to 0,40)
−0,13 (−0,25 to 0,007)
p value
0,28
0,08
0,0379
Workplace
Level compared
FEV25 -coefficient (95% CI)
FEV25 -coefficient (95% CI)
FEV25 -coefficient (95% CI)
Group
Welders
0
0
0
Operators
0,04 (−0,03 to 0,11)
0,02 (−0,40 to 0,45)
−0,02 (−0,15 to 0,10)
Others
−0,06 (−0,13 to 0,01
−0,24 (−0,66 to 0,16)
−0,07 (−0,20 to 0,05)
p value
0,09
0,22
0,23
Workplace
Level compared
FEV -coefficient (95% CI)
FEV -coefficient (95% CI)
FEV -coefficient (95% CI)
Group
Welders
0
0
0
Operators
−0,01 (−0,09 to 0,06)
0,34 (−0,06 to 0,75)
0,06 (−0,06 to 0,19)
Others
0,02 (−0,05 to 0,09)
−0,44 (−0,83 to −0,05)
−0,01 (−0,14 to 0,11)
p value
0,58
0,0268
0,29
Workplace
Level compared
FEV50 -coefficient (95% CI)
FEV50 -coefficient (95% CI)
FEV50 -coefficient (95% CI)
Group
Welders
0
0
0
Operators
−0,02 (−0,09 to 0,05)
0,39 (0,009 to 0,78)
0,01 (−0,11 to 0,14)
Others
0,03 (−0,04 to 0,10)
−0,41 (−0,79 to −0,04)
0,01 (−0,12 to0,14)
p value
0,49
0,0282
0,83
Workplace
Level compared
FEV75 -coefficient (95% CI)
FEV75 -coefficient (95% CI)
FEV75 -coefficient (95% CI)
Group
Welders
0
0
0
Operators
−0,03 (−0,11 to 0,04)
0,04 (−0,37 to 0,46)
0,07 (−0,05 to 0,20)
Others
0,07 (0,001 to 0,15)
0,03 (−0,36 to 0,44)
0,002 (−0,12 to 0,13)
p value
0,44
0,83
0,23
CI: confidence interval; values in bold indicate statistical significance.
