Overall prevalence has increased since the first case was detected in 1984.

The prevalence increases to 30% in patients 75 to 85 years of age.

From 1991 to 1998, the prevalence of obesity among people ages 60 to 69 increased 45 percent, the association said.

Attention has been focused on whether the prevalence of autism is increasing with time.

Its prevalence increases with age, reaching 44 percent in men older than 85 years.

The prevalence of diabetes increased from 4.3% to 7.3% between 1990 and 2000.

Public health officials predict the prevalence of stroke will increase as the population ages.

The prevalence of asthma has increased significantly since the 1970s.

The prevalence of high blood pressure in the young is increasing.

Among those 65 to 74, prevalence increased from 21 to 31 per 100 enrollees.