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Frequencies of MN in the study subjects
| Groups | Number | MN frequencies (‰) | FR (95% CI) | χ2 | P |
| Control group 1 | 97 | 1.24 ± 1.281 | 1 | ||
| Control group 2 | 44 | 1.18 ± 1.161 | 1.047 (0.761–1.461) | 0.08 | 0.78 |
| Pooled group (1 + 2) | 141 | 1.22 ± 1.243 | 1 | ||
| Exposure group | 402 | 4.55 ± 2.751 | 3.734 (3.204–4.381) | 272.89 | <0.001 |
