Contamination | Concentration > 0.05 μg/l | 0 < Concentration < 0.05 μg/l | P-value |
SITE 1 | 7 (50.0%) | 7 (50.0%) | 0.217 |
SITE 2 | 6 (40.0%) | 9 (60.0%) |
|
SITE 3 | 19 (73.1%) | 7 (26.9%) |
|
SITE 4 | 6 (37.5%) | 10 (62.5%) |
|
SITE 5 | 14 (48.3%) | 15 (51.7%) |
|
SITE 6 | 11 (44.0%) | 14 (56.0%) |
|
SITE 7 | 15 (60.0%) | 10 (40.0%) |
|