Examining Associations Between Environmental Exposures and Neurobehavioral Symptoms in Post-9/11 Veterans With a Probable History of TBI.
Kelsey M Schilling, Leah D Talbert, Elizabeth Valocchi and 2 others
Veterans with probable TBI who reported more environmental exposures (burn pits, solvents, metals) had higher symptom scores on a 0-88 scale.
Because data were collected at one time point from self-report, this shows a link, not a cause.
Key findings
1Greater cumulative environmental exposure burden was associated with higher NSI total score, higher symptom breadth (PST), and higher vestibular, somatic/sensory, and affective subscale scores. The cognitive subscale was not significantly associated.
2Individual exposures showed distinct patterns: other metals and solvents/fuels were associated with the most NSI outcomes (five and four of six, respectively), CBW agents with three, lead and pesticides with two each, combustion products with one, and burn pits with none.
3The cross-sectional design and reliance on self-reported exposures mean the study cannot establish that environmental exposures caused the neurobehavioral symptoms.
Still to come
How it was doneWhat they foundWhat it means for PTs
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What it does not show
Cross-sectional design: exposures and symptoms were measured at the same time, so the study cannot show that exposures came before or caused the symptoms. Exposures were self-reported on a survey, which is subject to recall bias and uncertainty (participants could answer 'don't know'). No data on exposure duration, intensity, frequency, or cumulative dose, so dose-response relationships cannot be assessed. The sample was 86.74% male and 70.88% had a PTSD diagnosis, which limits generalisability to female Veterans and to patients without PTSD. The 'don't know' exposure responses were coded as unexposed in the primary analysis, which may dilute true associations. The cognitive NSI subscale showed no significant association with any exposure, so the findings do not extend to cognitive complaints.
Declared interests
The authors declare no competing financial interests or personal relationships that could have influenced the work.
The easy way to misread this
Do not read these associations as proof that environmental exposures cause TBI symptoms. The data come from one time point and rely on self-report, the effect sizes are small (the largest individual-exposure coefficient was 3.88 on an 88-point scale), and the authors state that causal inference is not possible.
Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →