Differences in oral mucositis index (OMI) days 6 to 12 and 1 to 18 after transplantation (mean ± SE).

Patients with the homozygous variant MTHFR TT genotype have higher OMI scores. Adjusted mean OMI scores in patients with the wild type CC genotype (reference group) are 18.4 for days 6 to 12 and 15.9 for days 1 to 18 after transplantation, corresponding to an increase of 20% and 36% in the OMI score, respectively, among patients with the TT genotype. All analyses are adjusted for patients' age, sex, conditioning regimen, total methotrexate dose, height, and body weight.