Presence of C677T polymorphism in the MTHFR
| C677T genotype | Daytime workers n (%) | Shift workers n (%) |
|---|---|---|
| C677T polymorphism: CC, homozygous for the wild type; CT, heterozygous, and TT, homozygous for the mutation. | ||
| CC | 11 (50.00) | 19 (63.33) |
| CT | 9 (41.00) | 11 (36.67) |
| TT | 2 (9.00) | 0 (0) |