Table 1

Cross classification of percentage of subjects living in areas with high concentrations of chloroform or bromodichloromethane (BDCM)

Chloroform
<100 μg/l⩾100 μg/lTotal
BDCM:
 <20 μg/l82.212.394.5
 ⩾20 μg/l3.32.25.5
 Total85.514.5100