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Educational Level Modifies the Relationship between Standard Deviation of NN Intervals and Post-traumatic Stress
Ji Min Yoo1, Ju-Wan Kim1, Hee-Ju Kang1
1Department of Psychiatry, Chonnam National University Medical School, Gwangju, Korea.
Summary
Lower standard deviation of NN intervals (SDNN) predicts post-traumatic stress disorder (PTSD) in highly educated individuals. This highlights education-dependent risk factors for PTSD after physical injury.
Area of Science:
- Psychiatry
- Cardiology
- Trauma Medicine
Background:
- Heart rate variability, specifically the standard deviation of NN intervals (SDNN), is a marker of autonomic function.
- Post-traumatic stress disorder (PTSD) is a debilitating condition that can develop after traumatic events.
- Educational attainment is a known socio-demographic factor influencing health outcomes.
Purpose of the Study:
- To investigate the moderating role of educational level on the association between SDNN and PTSD development.
- To determine if lower SDNN is a risk factor for PTSD in trauma survivors, and if this relationship is influenced by education.
Main Methods:
- Prospective cohort study of 538 physically injured patients from a trauma center.
- Assessment of SDNN and educational attainment at baseline.
- PTSD diagnosis using the Clinician-Administered PTSD Scale for DSM-5 at 3, 6, 12, and 24 months post-injury.
- Logistic regression analyses to examine interaction effects.
Main Results:
- 10.8% of participants developed PTSD.
- A significant interaction between SDNN and education was found.
- Lower SDNN was associated with increased PTSD risk only in participants with higher education levels.
Conclusions:
- Educational level significantly modifies the relationship between SDNN and PTSD development.
- The findings underscore the importance of considering educational attainment in PTSD risk assessment and prevention strategies.
- Tailored interventions may be necessary for individuals with lower SDNN and higher education to mitigate PTSD risk.
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