1 - Scientists from the UK and USA have recently reported that over the last 30 years the incidence of Type 2 diabetes has more than doubled.

2 - The geographic variation in incidence rates of breast cancer is considerable, and it has been correlated with the amount of animal fat in the diet.

3 - Due to the decline in the incidence of dental caries, demand for dental services that correspond to these problems has declined.

4 - In most countries, there has been a very great increase in recent years in the incidence of sexually transmitted diseases.

5 - The National Academy of Health has released findings that people who weigh over 200 pounds have a higher incidence of heart disease than do people weighing less than 200 pounds.