 In some of these studies, Type D was associated with a 4-fold increased risk of mortality, recurrent MI, or sudden cardiac death, independently of traditional risk factors, such as disease severity.However, a number of subsequent, larger scale studies have failed to replicate these findings.Consequently, some researchers have argued that these earlier, small (and therefore potentially statistically underpowered) studies that appeared to link Type D personality to mortality in CHD and CVD patients may have inadvertently reached exaggerated or false conclusions.