Design, objectives, and lessons from a pilot 25 year follow up re-survey of survivors in the Whitehall study of London Civil Servants

摘要

Conclusion-This pilot study demon- strated the feasibility of conducting a re-survey using postal questionnaires and mailed whole blood samples. The magni- tude of change in blood pressure and blood total cholesterol concentrations within individuals was greater than antici- pated, suggesting that such remeasure- ments may be required at different intervals in prospective studies to help interpret risks associations properly. These issues will be considered in a Re-survey of the remaining survivors of The Whitehall study.