Table 2

Prevalence of respiratory complaints in the past 12 months before the start of the study among welders, metal workers and office workers

Welders (n=97)Metal workers (n=125)Office workers (n=29)Total (n=251)
Chronic cough13147600208
Chronic sputum secretion121376311229
Shortness of breath446514115
Ever wheezing222317145174418
Wheezing >1 week in the past 2 years121365414229
Chest tightness11123327167
Disorders according to questionnaire:
 Chronic obstructive pulmonary disease1516973112711
 Chronic non-specific lung disease232515124144217
 Airways allergy111220164143514