Psychometric Evaluation of the Psychological Flexibility Scale for Adolescents

  • Thanpitcha Sannarin M.S. student, Department of Psychology, Faculty of Humanities, Chiang Mai University
  • Chaiyun Sakulsriprasert Department of Psychology, Faculty of Humanities, Chiang Mai University.
  • Kulvadee Thongpibul Department of Psychology, Faculty of Humanities, Chiang Mai University.
Keywords: Psychological Flexibility for Adolescents (PFSA); Acceptance and Commitment Therapy (ACT); Psychometric properties


Objective : To examine psychometric properties of Psychological Flexibility Scale for
Adolescents (PFSA).
Method : The samples were 312 high school students. For validity, confirmatory factor
analysis (CFA) was utilized for factorial validation. Concurrent validity was assessed as
correlation with Acceptance and action questionnaire (AAQ-II). Moreover, nomological
network with depression and mindfulness was investigated. For reliability, Cronbach’s
alpha coefficients and ω coefficients were estimated.
Result : The findings suggested that the 6-factor model of the PFSA demonstrated good
factor structures (χ2= 510.818, df = 309, p < .001, χ2/df = 1.653, CFI = .952, RMSEA =
.046). Moreover, it was found that psychological flexibility score was associated with
depression and mindfulness in accordance with theoretical expectation. In addition,
the PFSA demonstrated good internal reliabilities (Cronbach’s α ranged from .603 to
.790 and full-scale reliability at .897; ω reliability coefficients ranged from .634 to .847,
and full-scale reliability at .937)
Conclusion : The findings supported that the Psychological Flexibility Scale for
Adolescents is psychometrically sound questionnaire, which can be used for assessing
psychological flexibility in adolescents.


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How to Cite
Sannarin, T., Sakulsriprasert, C., & Thongpibul, K. (2020). Psychometric Evaluation of the Psychological Flexibility Scale for Adolescents. Journal of the Psychiatric Association of Thailand, 65(1), 25-36. Retrieved from