Ernest H. Friedman, MD, Departments of Medicine and Psychiatry, Case Western Reserve University, 1831 Forest Hills Boulevard, Cleveland, OH 44112-4313 (USA) In their study of healthy Italian blue-collar workers, Sanavio et al. [1] find that the content-based Jenkins Activity Survey type A score failed to differentiate subjects who were defined as type Al, A2, and non-A by the structured intervi...