The incidence of cancer did not rise during this time (fig 2).

The incidence of the disease has recently been rising in tropical Africa.

In the past 50 years, the incidence of melanoma has risen 760 percent.

Moreover, the incidence rises sharply with the age of the father.

And its incidence has been rising greatly in recent decades.

The incidence of the disease has risen about 75 percent since the early 1970's for reasons that are unclear.

In urban areas then, the incidence of syphilis was rising.

By last year, the incidence had risen to 17.5 percent.

The incidence of heterosexual transmission is rising in some European countries.

But the incidence of type 2 diabetes in children is rising.