A preliminary examination of the Anxiety Sensitivity Index-3 factor structure in older adults.

Background: Anxiety sensitivity (AS), as measured by the Anxiety Sensitivity Index-3 (ASI-3), exhibits three-factor and bifactor structures for younger adults. Less is known about the scale's structure within older adult samples.

Methods: We explored the ASI-3's factor structure in a sample of 135 older adults who completed the ASI-3 alongside measures of anxiety, general worry, dementia worry, and depression as part of a larger study. Structural equation modeling was used to determine the factor structure of the ASI-3 in this sample.

Results: A bifactor model was identified and factor loadings supported a general factor and specific physical and cognitive subfactors, but not the social concerns subfactor. Whereas the general factor was associated with anxiety, general worry, dementia worry, and depression, each subfactor had differential associations with these mood/anxiety variables. In particular, the cognitive concerns subfactor was strongly associated with depression and dementia worry.

Limitations: Generalizability of these findings is limited by a homogenous sample.

Conclusions: The observed factor structure of the ASI-3 in our sample aligns with increases in physical and cognitive health concerns during aging. Associations between the cognitive concerns subfactor and dementia worry suggest that this facet of the ASI-3 may be measuring age-related health concerns rather than concerns specific to anxiety symptoms. Future studies should examine whether AS cognitive concerns and dementia worry are overlapping constructs particularly for individuals concerned about their age-related cognitive changes. Age differences in AS and its correlates should be further studied to identify better methods of assessing for AS across the lifespan.