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Table 5 Change in predicted FEV1-values from 1987 through 2004 among 68 welders and 24 non-welders.

From: A prospective study of decline in lung function in relation to welding emissions

 

N

Predicted FEV1in 1987

Predicted FEV1in 2005

Change in predicted values, mean (95% CL)

Difference in decline [welders – referents, (95% CL)]

Smokers

     

    Welders

32

104 %

96 %

-8.1 (-12.6 to -3.6)

3.8 (-4.4 to +12.4)

    Non welders

121

107 %

103 %

-4.3 (-11.7 to +3.0)

Reference

Non-smokers

     

    Welders

36

109 %

109 %

-0.1 (-3.4 to +3.3)

1.6 (-5.1 to +8.4)

    Non welders

121

105 %

107 %

-1.6 (4.3 to +7.4)

Reference

All

     

    Welders

68

107 %

103 %

-3.02 % (-5.5 to -0.5)

1.5 (-3.6 to +6.5)

    Non-welders

241

106 %

105 %

-1.52 % (-6.0 to +2.8)

Reference

  1. 1 Eight non-welders with missing measurements of lung function at baseline
  2. 2 The average change in predicted values were adjusted for FEV1 level at baseline, body weight measured at follow-up and cigarette pack-years during the follow-up period.