The .gov means it’s official. Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site. The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely. Share Complex posttraumatic stress disorder (CPTSD) and borderline personality disorder (BPD), which are distinctive diagnoses, share the common risk factor of childhood abuse experiences. However, additional evidence is needed to determine which factors contribute to the manifestation of different symptoms. Participants were 499 South Korean early and midlife adults with primarily college level education who reported experiences of childhood abuse. They were enrolled from an online panel using a stratified sampling considering gender, age, and residence information. A latent class analysis (LCA) was conducted to identify the patterns of CPTSD and BPD symptoms. We adopted a three-step LCA to compare types of childhood abuse, invalidating environments, attachment styles, and pathological personality traits among different classes. The LCA revealed four classes. Class 1 showed the highest scores in all symptoms and risk factors. Class 2 was distinguished from Class 3 by the externalizing versus internalizing associated pathological personality traits. Class 3 experienced high emotional neglect in addition to other types of abuse and it also showed an additional avoidant attachment style. Class 4 showed low symptomatology. Class 1 was named as a CPTSD and BPD "comorbid" class, Class 2 as an "externalizing BPD" class, Class 3 as an "avoidant BPD" class, and Class 4 as a "low symptom" class. Childhood abuse may heighten the risk for high comorbidity of CPTSD and BPD as well as externalizing-internalizing subgroups of BPD. Beyond the identification of CPTSD and BPD, assessing attachment styles and pathological personality traits based on dimensional approaches would benefit the tailoring of effective treatment. Stopyra MA, et al. Rev Neurosci. 2022 Aug 8;34(1):103-128. doi: 10.1515/revneuro-2022-0014. Print 2023 Jan 27. Rev Neurosci. 2022. PMID: 35938987 Nestgaard Rød Å, et al. Eur J Psychotraumatol. 2021 Dec 9;12(1):2002028. doi: 10.1080/20008198.2021.2002028. eCollection 2021. Eur J Psychotraumatol. 2021. PMID: 34912502 Free PMC article. Review. Saraiya TC, et al. J Trauma Stress. 2021 Feb;34(1):56-68. doi: 10.1002/jts.22590. Epub 2020 Oct 1. J Trauma Stress. 2021. PMID: 33006199 Free PMC article. Jowett S, et al. Personal Disord. 2020 Jan;11(1):36-45. doi: 10.1037/per0000346. Epub 2019 Jul 1. Personal Disord. 2020. PMID: 31259603 Cloitre M, et al. Eur J Psychotraumatol. 2014 Sep 15;5. doi: 10.3402/ejpt.v5.25097. eCollection 2014. Eur J Psychotraumatol. 2014. PMID: 25279111 Free PMC article.