Table 1

 Characteristics of the study population at baseline examination

n%
*Unknown duration of employment: n = 1428.
Occupation
    Plumbers215615
    Carpenters201214
    Painters228116
    Plasterers169512
    Bricklayers435930
    Labourers197114
Age at baseline examination
    25–39 years642444
    40–44 years152911
    45–49 years195314
    50–54 years258618
    55–59 years168012
    60–64 years3022
    Mean (SD) years41.7 (10.8)
Nationality
    German1197483
    Former Yugoslavia7375
    Italian6745
    Turkish6554
    Other4343
Duration of employment in construction industry (years)*
    <15491438
    15–29444834
    ⩾30368428
    Mean (SD)20.7 (11.9)
Total14474100