During the DCCT/EDIC follow-up period, intensive treatment reduced the risk of nonfatal myocardial infarction, stroke, or death from cardiovascular disease by 57 percent (95 confidence interval, 12 to 79 percent; p=0.02).
Reference
The DCCT/EDIC Study Research Group. New England Journal of Medicine, 353:2643-2653, December 22, 2005.