Study participants were accurate when they reported that a parent had high blood pressure, high cholesterol level, or diabetes. Reports that a parent did not have diabetes, heart attack before age 55 years, or stroke before age 65 years were also accurate. However, participants were often wrong when they reported that a parent did not have high blood pressure or a high cholesterol level. In addition, reports that a parent had had a heart attack before age 55 years or a stroke before age 65 years were often wrong.