... if there was any doubt in your mind:
http://dailynews.yahoo.com/h/nm/20011221/sc/health_superstition_dc_1.html
http://dailynews.yahoo.com/h/nm/20011221/sc/health_superstition_dc_1.html
A researcher at the University of California, San Diego has found that deaths caused by heart attacks among U.S. residents of Chinese and Japanese descent tend to spike on the fourth of the month, an increase linked to the psychological stress brought about by fear of the number itself.