Sample

Number of cells analyzed

Micronuclei (number)

Micronuclei, % (mean ± SD)

NC

8500

12

0.14 ± 0.04

HWEA

8384

31

0.37 ± 0.06^**

CWEA

7483

15

0.20 ± 0.05

PC

6739

33

0.49 ± 0.07^***