Preassignment examination for personnel on Iwo Jima

The Japan Maritime Self-Defense Force (JMSDF) requires all personnel assigned to Iwo Jima to undergo a preassignment medical examination. The efficacy and benefit of this mandatory examination has not been evaluated objectively in depth. Our purpose was to review the health status of JMSDF personnel assigned to Iwo Jima and to evaluate the correlation of the preassignment medical examination to their current health status for the study period. We divided the participants into two groups. Group Y was composed of JMSDF personnel receiving a preassignment medical examination, and group N was composed of those personnel who did not receive the examination. After the annual health examination, health status was evaluated using objective criteria. We found little statistically significant difference among group Y and group N participants. However, proportionally more patients currently receiving care for or diagnosed with hypertension, hyperuricemia, or severe obesity were identified as being members of group N than group Y. We have demonstrated that the preassignment medical examination may contribute to predicting the health status of potential Iwo Jima personnel and may contribute to controlling the cost of care associated with these specific diagnoses by limiting the assignment of at-risk personnel.