Stroke Incidence, Mortality Down From 1987 to 2011
Prospective cohort study in four U.S. communities showed decrease for blacks and whites
TUESDAY, July 15, 2014 (HealthDay News) -- From 1987 to 2011 there was a decrease in stroke incidence and mortality rates in four U.S. communities, according to a study published in the July 16 issue of the Journal of the American Medical Association.
Silvia Koton, Ph.D., from Tel Aviv University in Israel, and colleagues examined trends in stroke incidence and subsequent mortality in the Atherosclerosis Risk in Communities cohort from 1987 to 2011. The cohort study involved 14,357 participants free of stroke at baseline from four different U.S. communities.
The researchers found that 1,051 participants (7 percent) had incident stroke, including 929 with incident ischemic stroke and 140 with incident hemorrhagic stroke. Over time, stroke incidence decreased in white and black participants (age-adjusted incidence rate ratio per 10-year period, 0.76). The decrease was evident in participants aged 65 years and older (age-adjusted incidence rate ratio, 0.69), but not in those younger than 65 years (age-adjusted incidence rate ratio, 0.97). There was a similar decrease in incidence by sex. Fifty-eight percent of participants with incident stroke died through 2011. Over time there was a decrease in mortality after stroke (hazard ratio, 0.80), with the decrease mainly due to a decrease at younger than age 65 years (hazard ratio, 0.65); the decrease was similar across race and sex.
"In a multicenter cohort of black and white adults in U.S. communities, stroke incidence and mortality rates decreased from 1987 to 2011," the authors write.