1. Vasey MW, Daleiden EL. Worry in children In: Davey GCL, Tallis F, editors. Worrying: perspectives on theory, assessment and treatment. Chichester: Wiley; 1994. p. 207
2. Barlow DH. Anxiety and its disorders: the nature and treatment of anxiety and panic. 2nd ed. New York: Guilford Press; 2002. p. 704
3. Borkovec TD. The nature, functions, and origins of worry In: Davey GCL, Tallis F, editors. Worrying: perspectives on theory, assessment and treatment. Chichester: Wiley; 1994. p. 33
4. American Psychiatric Association. Diagnostic and statistical manual of mental disorders 5th ed Arlington, VA: American Psychiatric Association; 2013 991
5. Pedrelli P, Nyer M, Yeung A, Zulauf C, Wilens T. College students: Mental health problems and treatment considerations. Academic Psychiatry. 2015;39(5):503-511.
https://doi.org/10.1007/s40596-014-0205-9
7. Wuthrich VM, Johnco C, Knight A. Comparison of the Penn State Worry Questionnaire (PSWQ) and abbreviated version (PSWQ-A) in a clinical and non-clinical population of older adults. Journal of Anxiety Disorders. 2014;28(7):657-663.
https://doi.org/10.1016/j.janxdis.2014.07.005
8. Jiménez-Ros AM, Carmona-Márquez J, Pascual LM. Pathological worry in Portugal: the Portuguese version of the Penn State Worry Questionnaire (PSWQ). The Spanish Journal of Psychology. 2019;22(e63):1-8.
https://doi.org/10.1017/sjp.2019.61
9. Carter MM, Sbrocco T, Miller Jr O, Suchday S, Lewis EL, Freedman REK. Factor structure, reliability, and validity of the Penn State Worry Questionnaire: differences between AfricanAmerican and White-American college students. Journal of Anxiety Disorders. 2005;19(8):827-843.
https://doi.org/10.1016/j.janxdis.2004.11.001
10. Castillo C, Macrini L, Cheniaux E, Landeira-Fernandez J. Psychometric properties and latent structure of the Portuguese version of the Penn State Worry Questionnaire. The Spanish Journal of Psychology. 2010;13(1):431-443.
https://doi.org/10.1017/s113874160000398x
11. Park HJ, Kim JH, Lee JH, Heo JY, Yu BH. The usefulness of the Korean version of Penn State Worry Questionnaire for screening generalized anxiety disorder: a receiver operating characteristic analysis. Psychiatry Investigation. 2014;11(1):12-17.
https://doi.org/10.4306/pi.2014.11.1.12
12. Lim YJ, Kim YH, Lee EH, Kwon SM. The Penn State Worry Questionnaire: psychometric properties of the Korean version. Depression and Anxiety. 2008;25(10):E97-E103.
https://doi.org/10.1002/da.20356
14. Yilmaz AE, Gençöz T, Wells A. Psychometric characteristics of the Penn State Worry Questionnaire and Metacognitions Questionnaire-30 and metacognitive predictors of worry and obsessive-compulsive symptoms in a Turkish sample. Clinical Psychology and Psychotherapy. 2008;15(6):424-439.
https://doi.org/10.1002/cpp.589
16. Wu SM, Schuler TA, Edwards MC, Yang HC, Brothers BM. Factor analytic and item response theory evaluation of the Penn State Worry Questionnaire in women with cancer. Quality of Life Research. 2013;22(6):1441-1449.
https://doi.org/10.1007/s11136-012-0253-0
18. Hazlett-Stevens H, Ullman JB, Craske MG. Factor structure of the Penn State Worry Questionnaire: examination of a method factor. Assessment. 2004;11(4):361-370.
https://doi.org/10.1177/1073191104269872
19. Jeon JW, Kim D, Kim E, Roh S. Exploratory and confirmatory factor analysis of the Korean version of the Penn State Worry Questionnaire. Anxiety and Mood. 2017;13(2):86-92.
https://doi.org/10.24986/anxmod.2017.13.2.86
21. Chorpita BF, Tracey SA, Brown TA, Collica TJ, Barlow DH. Assessment of worry in children and adolescents: an adaptation of the Penn State Worry Questionnaire. Behaviour Research and Therapy. 1997;35(6):569-581.
https://doi.org/10.1016/s0005-7967(96)00116-7
22. Spielberger CD, Gorsuch RL, Lushene R, Vagg PR, Jacobs GA. Manual for the State-Trait Anxiety Inventory. Palo Alto, CA: Consulting Psychology Press; 1983. p. 3
23. Kelly WE. Anxiety and stress as contributory factors in pathological and nonpathological worry. Psychology Journal. 2008;5(3):147-157.
24. Lim YJ, Lee SY, Kim JH. Distinct and overlapping features of anxiety sensitivity and trait anxiety: the relationship to negative affect, positive affect, and physiological hyperarousal. Korean Journal of Clinical Psychology. 2005;2: 439-449.
25. Marsh HW, Hau KT, Wen Z. In search of golden rules: comment on hypothesis testing approaches to setting cutoff values for fit indexes and dangers in overgeneralizing Hu & Bentler's (1999) findings. Structural Equation Modeling. 2004;11(3):320-341.
https://doi.org/10.1207/s15328007sem1103_2
28. Bollen KA. Structural equations with latent variables. New York: John Wiley and Sons Inc; 1989. p. 528
29. Comrey AL, Lee HB. A first course in factor analysis 2nd ed. Hillsdale, NJ: Lawrence Erlbaum; 1992. p. 442
30. Behar E, Alcaine O, Zuellig AR, Borkovec TD. Screening for generalized anxiety disorder using the Penn State Worry Questionnaire: a receiver operating characteristic analysis. Journal of Behavior Therapy and Experimental Psychiatry. 2003;34(1):25-43.
https://doi.org/10.1016/s0005-7916(03)00004-1