| Gender | Contaminated | Non-contaminated | Total |
| Male | 188 (85.45%) | 32 (14.54%) | 220 (39.29%) |
| Female | 300 (88.23%) | 40 (11.76%) | 340 (60.71%) |
| Total | 488 (87.14%) | 72 (12.87%) | 560 (100%) |