This treatment effect was still evident after the additional year of follow-up at which stage the risk reduction was 41% (Hazard Ratio = 0.59, 95% confidence interval (0.42, 0.83), p = 0.0011). Within the study period of three years, CDMS occurred in 51% of the delayed treatment group compared to 37% of the immediate treatment group (Kaplan-Meier estimates).