Dr. Howard noted that several factors could be contributing to the unexplained differences in stroke incidence that remain between these two groups, including differential susceptibility to risk factors, residual confounding, impact of "nontraditional" risk factors, and measurement error.
The study is supported by the National Institute for Neurological Disorders and Stroke. Dr. Howard disclosed that he has received personal compensation from Bayer Healthcare and has received research support from Amgen and Bayer Healthcare.