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We present data on the effects of a heart health education intervention targeted at adult Southeast Asians. Within each of the Cambodian, Laotian, and Vietnamese groups who received the intervention, we obtained random samples approximately three to 18 months postintervention. Comparisons were made between preintervention and postintervention knowledge of blood pressure and awareness of behaviors to prevent heart disease. Within all three ethnic samples, we found significant increases in the pre-to-post percentages of individuals who could define blood pressure and identify ways to prevent heart diseases. [Am J Prev Med 1994;10:205–8]