Kaplan–Meier Survival Analysis of Time to Death in the Intention-to-Treat Population. The intention-to-treat population included 2,430 patients. The hazard ratio in the fresh-blood group, as compared with the standard-blood group, was 1.1 (95% CI, 0.9-1.2).From The New England Journal of Medicine, Lacroix J et al, Age of Transfused Blood in Critically Ill Adults, vol. 372, page 1416, Copyright © 2015 Massachusetts Medical Society. Reprinted with permission from Massachusetts Medical Society.