8 Risk Analysis and Management (Morgan, Sci Am July 1993) “When people are asked to order well-known hazards in terms of the number of deaths and injuries they cause every year, on average they do it pretty well. If, however, they asked to rank those hazards in terms of risk, they produce quite a different order.”
9 People rank risks on: 1.How well the process in question is understood 2.How equitably the danger is distributed 3.How well the individuals can control their exposure (voluntary?)
10 These factors can be grouped for risk analysis into categories: 1.Degree of dreadfulness (e.g., affects innocent bystanders?) 2.How well is the risk understood 3.Number of people exposed
Categories can be used to define a “risk space” which pictorially shows how people will react to a particular hazard. Risks that carry a high level of “dread” provoke more calls for government intervention than some more workaday risks that actually cause more deaths or injuries.
13 Total Number of Deaths: 215,669 Cardiovascular (ICD-9 390-459); Respiratory (ICD-9 460-519); Diabetes (ICD-9 250); Cancer (ICD-9 140-239); Infectious Diseases (ICD- 9 001-139); Accidents/Poisonings/Violence (ICD-9 E800-E999) Source: Statistics Canada, 1997 All Cardiovascula r Disease (79,457) 36% Leading Causes of Death - Canada, 1997