Given the possibility of confounding related to higher prevalences of psoriasis and inflammatory bowel disease in the non-anti-IL-23 group, a sensitivity analysis was performed whereupon propensity matching was performed upon the presence of psoriasis and inflammatory bowel disease ICD-10 codes (L40 and E08-E13, respectively) in addition to age/sex and we found similar results (n in propensity matched groups = 9,076; mortality odds ratio = 0.248 (95% confidence interval 0.177–0.347). This evidence concerns the gene IL23A and inflammatory bowel disease.