CYP2R1 and delirium: We tested the association between a low-frequency variant in CYP2R1 (rs117913124, vitamin D–decreasing minor allele frequency 2.77% in the studied sample) identified in a separate study19 and incident delirium, and found there was no significant association (sHR 1.05, 95% CI 0.74–1.49, p = 0.78).