Table II. Incidence of BP distribution in the four Hospitals belonging to the Health District 'ASL RM/E" in Rome, Italy.

Hospital	Total number of cases of BP, in 3 years	Estimated population at risk	Cumulative incidence (per 100,000 per year)
S. Andrea	125	218,357	57.25
S. Filippo	97	180,557	53.72
Gemelli	94	180,557	52.06
S. Carlo	65	135,038	48.13
Total	381	714,509	53.32