MGMT and glioblastoma: In the adjusted model, the associations with MGMT methylated promoter (OR 14.13, 95% CI 3.88–51.43), receiving a gross total/total microscopic resection (OR 2.73, 95% CI 1.01–7.33) and a glioblastoma diagnosis (OR 0.03, 95% CI 0.01–0.09) persisted.