Direct mail as a prompt for follow-up care among persons at risk for hypertension.

We undertook a direct mail campaign to urge persons identified as being at risk for hypertension to seek medical advice. Those who received a single mailing displayed a 28% increase in the proportion who subsequently discussed their blood pressure with a physician and a 12% increase in the proportion who had their blood pressure rechecked, while those persons who received six mailings reported an equivalent increase in physician discussions but a smaller increase in rechecking their blood pressure. These results support the use of inexpensive social marketing strategies as follow-up methods for blood pressure screening programs.