| No. | ORs (95% confidence interval) | |||
---|---|---|---|---|---|
MTR | Hearing impairment | No hearing impairment | MTHFR/T-allele | folate | homocysteine |
AA | 126 | 626 | 0.602 * | 0.946 | 1.066 * |
 |  |  | (0.421-0.861) | (0.861-1.039) | (1.021-1.113) |
AG | 71 | 281 | 1.379 | 0.941 | 0.953 |
 |  |  | (0.830-2.292) | (0.816-1.084) | (0.893-1.017) |
GG | 7 | 35 | Data not shown (the validity of the model fit is questionable due to small number). |