Table 1

Characteristics of incinerator workers and control workers at the three areas

IIIIII
Incinerator workersControlsIncinerator workersControlsIncinerator workersControls
*p<0.05.
Workers (n)777766
Age (y, mean (SD))44.1 (5.5)43.0 (5.7)40.6 (11.1)41.6 (9.9)38.7 (8.3)41.7 (8.1)
Duration of employment at incineration plant (year, mean (SD))11.0 (5.1)010.3 (3.4)015.7 (7.3)0
Previous job with potential for exposure to dioxin in agriculture (workers, n)212302
Dietary habit (times/week, mean (SD)):
    Fish9.1 (3.6)7.3 (2.7)6.6 (2.4)6.4 (2.6)10.2 (4.5)8.0 (3.2)
    Meat4.6 (3.5)7.6 (3.5)8.1 (3.7)8.1 (3.1)4.7 (2.4)5.7 (4.2)
    Milk2.4 (2.1)5.1 (10.1)4.0 (4.6)3.9 (3.2)5.0 (5.1)5.8 (3.9)
Current smoking:
    Non-smokers (workers, n)133213
    Smokers (workers, n)644553
    Smorking habit index (cigarettes/day×year, mean (SD))699 (367)*274 (336)327 (440)263 (296)141 (140)89 (143)
Body mass index (kg/m2, mean (SD))23.9 (3.6)24.7 (3.7)22.4 (2.3)24.2 (2.1)24.6 (3.8)22.1 (2.8)