Age-adjusted1 and multivariable-adjusted2 hazard ratios and 95% confidence intervals for skin cancers by ABO blood type.

1Age-adjusted.2Multivariate-adjusted for sunburn reaction, family history of melanoma, number of severe sunburns, number of moles, hair color, sun exposure, and residence at different ages.3The combined analysis of the two cohorts additionally adjusted for gender.4Number of person-years: 995,274, 850,292, 180,025, and 305,206 for O, A, AB, and B blood types, respectively.