What makes records and statistics on accidents valuable in contributing towards improving health and safety?

Epidemiology. Is how we learn about many aspects of medicine. A single doctor cannot see tghe whole picture. For instance we see the incidence of heart disease rising in direct proportion to the effort to advertise and promite cheese and meat in our diet in the 50's. We see a rise in lyphoma and leukewmia in directr proportion toxray dosage given to patients. We know in our minds that these associations cot.