The number of chronic medical conditions (NCMC) experienced by an individual may be a measure of health and predictor of the disqualification of aviators. Subjects were 727 medically disqualified and 807 current pilots and navigators in the Russian Air Forces. All chronic conditions reported in medical files were extracted.
Disqualification was earlier for subjects who had diagnoses of chronic conditions at age 29 (chi 2 = 82.24, p