title: Two year follow up of pulmonary function values among welders in New Zealand.
abstract: OBJECTIVE
  To examine whether welding is a risk factor for an accelerated decline in pulmonary function.
  
  
  METHODS
  2 Year follow up of pulmonary function and respiratory symptoms among 54 welders and 38 non-welders in eight New Zealand welding sites.
  
  
  RESULTS
  There were no significant differences in age, height, smoking habits, ethnicity, or total time in industrial work between welders and non-welders. No overall differences were noted in the changes of pulmonary function variables between the two study groups. However, when the comparison was restricted to smokers, welders had a significantly greater (p = 0.02) annual decline (88.8 ml) in FEV1 than non-welders, who had a slight non-significant annual increase (34.2 ml). Also, welders without respiratory protection or local exhaust ventilation while welding had a greater annual decline both in forced vital capacity (FVC) and forced expiratory volume in one second (FEV1) than welders with protection (p = 0.001 and 0.04, respectively). Among welders a significant association was found between the acute across shift change and the annual decline in FEV1. Chronic bronchitis was more common among welders (24%) than non-welders (5%). Only one welder (2%) but eight non-welders (21%) reported having asthma.
  
  
  CONCLUSIONS
  Welders who smoked and welders working without local exhaust ventilation or respiratory protection have an increased risk of accelerated decline in FEV1.
authors.affiliation: Department of Medicine, Wellington School of Medicine, New Zealand.
authors.forename: R
authors.initials: R
authors.lastname: Erkinjuntti-Pekkanen
authors.forename: T
authors.initials: T
authors.lastname: Slater
authors.forename: S
authors.initials: S
authors.lastname: Cheng
authors.forename: D
authors.initials: D
authors.lastname: Fishwick
authors.forename: L
authors.initials: L
authors.lastname: Bradshaw
authors.forename: M
authors.initials: M
authors.lastname: Kimbell-Dunn
authors.forename: L
authors.initials: L
authors.lastname: Dronfield
authors.forename: N
authors.initials: N
authors.lastname: Pearce
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D001991:Bronchitis / Q000503:physiopathology; D016022:Case-Control Studies; D016009:Chi-Square Distribution; D005500:Follow-Up Studies; D005541:Forced Expiratory Volume; D006801:Humans; D008168:Lung / Q000503:physiopathology*; D008171:Lung Diseases / Q000503:physiopathology*; D008297:Male; D009784:Occupational Diseases / Q000503:physiopathology*; D012044:Regression Analysis; D012129:Respiratory Function Tests; D012907:Smoking / Q000009:adverse effects; D014797:Vital Capacity; D014896:Welding