Predictors and (in-)stability of ICD-11 complex posttraumatic stress disorder in older adults: findings from a longitudinal study in Switzerland.

Objective: There is a lack of research on complex post-traumatic stress disorder (CPTSD) in older individuals, with little known about the temporal course of CPTSD. Therefore, this study assessed and compared the demographic characteristics, adverse childhood experiences (ACE), and well-being of Swiss older adults with and without probable CPTSD. The (in-)stability of probable CPTSD was also examined in relation to the predictive value of various emotion-related factors. Methods: A longitudinal study was conducted in Switzerland with N  = 213 participants ( M age  = 69.98 years, SD  = 10.61; 45.5% female). Data was collected via face-to-face assessments at baseline and follow-up, 21 months apart. The German version of the International Trauma Questionnaire was used to screen for (C)PTSD. Standardized instruments were used to assess ACE as well as the predictors anger, embitterment, emotion regulation, and meaning in life. Results: From the total sample, n  = 16 participants (7.5%) were identified as having probable CPTSD, with only five of these (31.25%) having probable CPTSD at both baseline and follow-up. Individuals with and without probable CPTSD differed significantly regarding age and employment status. Significant predictors of probable CPTSD were anger ( β  = 0.16), embitterment ( β  = 0.06), cognitive reappraisal ( β  = -0.41), and the presence of meaning in life ( β  = -0.10). Conclusions: Probable CPTSD appears to be relatively unstable over the course of a 21-month period in older individuals. The links between CPTSD and emotion-related predictors highlight potential targets for intervention.