Current combat-related disorders in the absence of PTSD among Australian Vietnam veterans

The research literature on the psychiatric consequences of the Vietnam War focuses primarily on the construct of Posttraumatic Stress Disorder (PTSD), after an initial focus in the 1970s on depression and alcohol and substance abuse. The present paper examines the hypothesis that among men without current PTSD, those with higher combat in Vietnam will be more likely to have current DSM-III-R illnesses. The Australian Vietnam Veterans' Health Study (AVVHS) collected a broad range of interview data on 641 Vietnam veterans throughout 1990-1993. Measures of combat exposure, age at embarkation to Vietnam, enlistment IQ and pre-Army personality problems were drawn from Army records of the era. Retrospective measures of combat were obtained at interview. The interview also involved the administration by trained lay interviewers of the DSM-III-R based Diagnostic Interview Schedule (DIS). This epidemiological instrument provides current psychiatric diagnoses as well as temporal (retrospective) symptom and diagnosis onset data. The results of this study show that current disorders (without PTSD comorbidity) with onsets within 5 years of embarkation to Vietnam are more likely among men who saw higher combat, as indexed by combat-exposure measures drawn from Army records of the era as well as retrospective self-report. This combat relatedness remains when age at embarkation. IQ at enlistment and pre-Army personality measures are used as covariates. No more than 11.4% of sampled Vietnam veterans currently meet DSM-III-R diagnostic criteria for PTSD, while a further 7.8% do not have current PTSD but do have some other current DIS diagnosis with onset in the 5-year period following (first) emabarkation to Vietnam. Our data support the hypothesis that the current illnesses of many of these men without PTSD are combat-related DSM-III-R illnesses.