Associations between changes in somatic and psychiatric symptoms and disability alterations in recent-era U.S. veterans

Poorer Inhibitory Control Uniquely Contributes to Greater Functional Disability in Post-9/11 Veterans

OBJECTIVE

Post-9/11 Veterans endorse greater self-reported functional disability than 80% of the adult population. Previous studies of trauma-exposed populations have shown that increased post-traumatic stress disorder (PTSD) and depressive symptoms are consistently associated with greater disability. Additionally, poorer cognitive performance in the domain of executive functions, particularly inhibitory control, has been associated with disability, though it is unclear if this effect is independent of and/or interacts with PTSD and depression.

METHOD

Three overlapping samples of n = 582, 297, and 183 combat-deployed post-9/11 Veterans completed comprehensive assessments of executive functions, PTSD and depressive symptoms, and self-reported World Health Organization Disability Assessment Schedule-II (WHODAS II).

RESULTS

Poorer performance on measures of inhibitory control (Delis-Kaplan Executive Functioning System Color-Word Interference-CWI Test and gradual-onset Continuous Performance Test-gradCPT), but not other executive functions, were significantly associated with greater disability on the WHODAS II (ρ's = -.13 and -.13, p = .002 and .026, respectively). CWI inhibitory control measures accounted for unique variance in disability after controlling for PTSD and depressive symptoms (R2 change = 0.02, p < .001). Further, CWI significantly moderated the effect of depressive symptoms on disability, such that better inhibitory control weakened the relationship between depression and disability.

CONCLUSIONS

Inhibitory control deficits are uniquely associated with increased disability in combat-deployed post-9/11 Veterans, and better inhibitory control abilities may serve as a protective factor for depressive symptoms leading to increased disability.

KEY POINTS

Longitudinal Associations Between Disaster Damage and Falls/Fear of Falling in Older Adults: 9-Year Follow-Up of Survivors of the 2011 Great East Japan Earthquake and Tsunami

Background and Objectives

Fear of falling and falls are common in older adults. However, their associations with natural disaster exposures remain poorly understood. This study aims to examine longitudinal associations between disaster damage with fear of falling/falls among older disaster survivors.

Research Design and Methods

In this natural experiment study, the baseline survey (4,957 valid responses) took place 7 months before the 2011 Great East Japan Earthquake and Tsunami, and 3 follow-ups were conducted in 2013, 2016, and 2020. Exposures were different types of disaster damage and community social capital. Outcomes were fear of falling and falls (including incident and recurrent falls). We used lagged outcomes in logistic models adjusting for covariates and further examined instrumental activities of daily living (IADLs) as a mediator.

Results

The baseline sample had a mean (standard deviation) age of 74.8 (7.1) years; 56.4% were female. Financial hardship was associated with fear of falling (odds ratio (OR), 1.75; 95% confidence interval (CI) [1.33, 2.28]) and falls (OR, 1.29; 95% CI [1.05, 1.58]), especially recurrent falls (OR, 3.53; 95% CI [1.90, 6.57]). Relocation was inversely linked with fear of falling (OR, 0.57; 95% CI [0.34, 0.94]). Social cohesion was protectively associated with fear of falling (OR, 0.82; 95% CI [0.71, 0.95]) and falls (OR, 0.88; 95% CI [0.78, 0.98]) whereas social participation increased the risk of these issues. IADL partially mediated observed associations between disaster damage and fear of falling/falls.

Discussion and Implications

Experiences of material damage rather than psychological trauma were associated with falls and fear of falling, and the increased risk of recurrent falls revealed a process of cumulative disadvantage. Findings could inform targeted strategies for protecting older disaster survivors.