Table 1

 Characteristics of the cases and controls in the study

CharacteristicControls (n = 180)Cases (n = 45)Total (n = 225)
*Total: The sum of people with such a history at the pre-employment examination and those with a subsequent history during their employment at the smelter.
Age (years)26.7 (±6.1)26.6 (±6.3)26.7 (±6.2)
Height (cm)176.9 (±5.9)175.9 (±6.6)176.7 (±6.0)
Weight (kg)78.3 (±11.7)79.7 (±10.4)78.6 (±11.2)
Body mass index25.0 (±3.23)25.77 (±3.2)25.16 (±3.2)
Ethnicity
    Caucasian166 (92.2%)40 (88.9%)206 (91.6%)
    Maori/Samoan20 (11.1%)6 (13.3%)26 (11.6%)
    Other1 (0.6%)01 (0.4%)
Tobacco smoking (at employment)
    Never smokers79 (43.9%)18 (40%)97 (43.1%)
    Ex smokers22 (12.2%)4 (8.9%)26 (11.6%)
    Current smokers79 (43.9%)23 (51.1%)102 (45.3%)
Tobacco consumption
    None101 (56.1%)22 (48.9%)123 (54.7%)
    Light smokers10 (5.6%)1 (2.2%)11 (4.9%)
    Moderate smokers48 (26.7%)17 (37.8%)65 (28.9%)
    Heavy smokers21 (11.7%)5 (11.1%)26 (11.6%)
Smoking at termination or diagnosis59 (32.8%)19 (42.3%)78 (34.7%)
Hay fever at employment15 (8.5%)6 (13.3%)21 (9.5%)
Hay fever (total)*24 (13.3%)14 (31.1%)38 (16.9%)
Familial asthma (at employment)18 (10.0%)6 (14.3%)24 (10.8%)
Familial asthma (total)*40 (22.2%)12 (26.7%)52 (23.1%)
Childhood history of asthma2 (1.1%)1 (2.2%)3 (1.3%)
Previous history of bronchitis1 (0.6%)1 (2.2%)2 (0.9%)
Previous history of dermatitis10 (5.6%)3 (6.7%)13 (5.8%)
Cough at employment2 (1.1%)0 (0%)2 (0.9%)
Wheeze at employment3 (1.7%)0 (0%)0 (0%)