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Means and Ends
Pages 1-4

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From page 1...
... Second, military cohorts by their constitution often differ in small, yet important, ways from the nonmilitary cohorts available for study. The first advantage in studies of military and veteran cohorts, efficiency of data gathering, comes about from things like the ready availability of material from which to assemble study cohorts and the possibility of attaining a very high degree of completeness of follow-up without great expense.
From page 2...
... However, it should be pointed out that representativeness is a complicated matter, and that the active-duty military population is not strictly representative of the general population. In particular, the military induction examination screens from military service certain persons with selected medical conditions, no doubt with varying rates of success; hemophiliacs, for example, are almost certainly screened out.
From page 3...
... As reported by these authors, the treatment of military personnel during captivity -- as evidenced, for example, by an average body weight loss during captivity of almost 40 percent among prisoners of the Japanese-seems unparalleled in its brutality; thus, it might be expected to produce correspondingly singular psychological after-effects. However, it turns out that the psychological after-effects of military captivity are similar to the more general after-effects of other serious trauma, such as being the victim of a natural disaster.


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