The Role of Psychological Inflexibility in Adolescents' Loneliness

School Friendship Closeness as a Mediator

Bibliographic Data

ID21391968
AuthorsAnnina Jormanainen (Department of Psychology University of Jyvaskyla Jyväskylä Finland), Kaisa Kalttila (Department of Psychology University of Jyvaskyla Jyväskylä Finland), Tetta Hämäläinen (0000-0003-4100-8888, Department of Psychology University of Jyvaskyla Jyväskylä Finland), Päivi Lappalainen (0000-0001-9038-894X, Department of Psychology University of Jyvaskyla Jyväskylä Finland), Mari Tunkkari (0000-0002-1498-5256, Department of Psychology University of Jyvaskyla Jyväskylä Finland), Noona Kiuru (0000-0002-2334-8507, Department of Psychology University of Jyvaskyla Jyväskylä Finland, corresponding author)
Year2026
Volume67
Issue2
Pages620-631
Publication date2026-04-01
Peer ReviewedYes
Open AccessYes
TypeARTICLE
VenueScandinavian Journal of Psychology (JOURNAL)
Journal identifiersISSN: 0036-5564 • E-ISSN: 1467-9450
PublisherWiley (PUBLISHER • GB)
DOI10.1111/sjop.70053
PMID41312587
OpenAlexW4416780494
LanguageEN
References cited51

This study aimed to expand knowledge on the roles of psychological inflexibility and school friendship closeness in adolescents' loneliness during the transition to upper secondary education. The participants were 885 Finnish adolescents (mean age = 15.74, SD = 0.37, 56% girls). Loneliness was measured twice: in Grade 9 and at the beginning of upper secondary school in 10th grade. Psychological inflexibility and the closeness of friendships in school were measured in Grade 9. Results showed that a high level of psychological inflexibility in Grade 9 was associated with higher loneliness at the beginning of upper secondary education and increased loneliness during the educational transition. Furthermore, girls' (but not boys') friendship closeness in school partly mediated the association between psychological inflexibility and loneliness. The results suggested that psychological inflexibility is a social risk factor for loneliness among adolescents transitioning to upper secondary school. Enhancing psychological flexibility skills could thus make an important contribution to the promotion of adolescent peer relationships and prevention of loneliness

Association (psychology) · Closeness · Flexibility (engineering) · Friendship · Interpersonal relationship · Loneliness · Promotion (chess) · Attachment and Relationship Dynamics · Bullying, Victimization, and Aggression · Resilience and Mental Health

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