Increasing interest in melancholy is not, however, evidence of an increase in the prevalence of actual melancholy.
"Because the population is aging and there's a high proportion of untreated blood pressure, we expect there will be an increase in the prevalence of hospitalization for stroke.
Though large, this increase does not necessarily provide evidence of an autism epidemic or an actual increase in the prevalence of autism.
But there are two countertrends that are cause for serious concern about the future of heart disease in this country: the overall increase in weight and the accompanying increase in the prevalence of diabetes.
For example, a 2006 study in the American Journal of Psychiatry showed that in the US, there was a 4% increase in the prevalence of major depressive disorder between 1991/92 and 2001/02.
It was largely the result of an increase in the prevalence of usage — that is, in the number of people who were given a diagnosis of the disease and who then bought drugs to treat it.
The remarkable increase in the prevalence of neurodegenerative diseases has become a serious public health problem.
Unfortunately, this has led to the increase in the prevalence of chronic diseases.
Unruptured SIA is associated with a marked increase in the prevalence of migraine without aura which decreases significantly after clipping.
On balance, neither systemic nor these two local factors explain the observed marked increase in the prevalence of MO.
There was a striking increase in the prevalence of RCMD in younger patients relative to other subtypes (WHO).
