A series of factor analyses evaluated the dimensionality of the Mississippi Scale for Combat-Related Post-Traumatic Stress Disorder. Over 2,200 Vietnam theater and era veterans were divided into three random subsamples, each of which was used in a separate stage of analysis. Initial exploratory factor analyses suggested an underlying single-factor solution. In the second subsample, a second-order solution comprised of a general factor subsuming several first-order factors was supported using chi-square difference testing. This model was successfully replicated with the third subsample. Cumulative evidence suggests that the latent structure of the Mississippi Scale is best represented as an umbrella Post-Traumatic Stress Disorder (PTSD) factor leading to four subsidiary facets or dimensions.
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References
1.
American Psychiatric Association. (1980). Diagnostic and statistical manual of mental disorders (3rd ed.). Washington, DC: Author
2.
American Psychiatric Association. (1987). Diagnostic and statistical manual of mental disorders (3rd ed., rev.). Washington, DC: Author
3.
AndersonJ. C.GerbingD. W. (1988). Structural equation modeling in practice: A review and recommended two-step approach. Psychological Bulletin, 103, 411–423
4.
BagozziR. P.HeathertonT. F. (1994). A general approach to representing multifaceted personality constructs: Application to state self-esteem. Structural Equation Modeling: A Multidisciplinary Journal, 1, 35–67
5.
BentlerP. M. (1990). Comparative fit indexes in structural models. Psychological Bulletin, 107, 238–246
6.
BentlerP. M.BonettD. G. (1980). Significance tests and goodness of fit in the analysis of covariance structures. Psychological Bulletin, 88, 588–606
7.
BernsteinI. H.TengG. (1989). Factoring items and factoring scales are different: Spurious evidence for multi-dimensionality due to item categorization. Psychological Bulletin, 105, 467–477
8.
BrettE.SpitzerR.WilliamsJ. (1988). DSM-III-R criteria for post-traumatic stress disorder. American Journal of Psychiatry, 145, 1232–1236
9.
BriggsK. C.MyersI. B. (1976). Myers-Briggs Type Indicator: Form F. Palo Alto: Consulting Psychologists Press
10.
BrowneM. W. (1984). Asymptotic distribution free methods in analysis of covariance structures. British Journal of Mathematical and Statistical Psychology, 37, 62–83
11.
ByrneB. B. (1988). Testing the factorial validity and invariance of a measuring instrument using LISREL confirmatory factor analysis: A reexamination and application. Multiple Linear Regression Viewpoints, 16, 33–80
12.
CampbellD. T.FiskeD. W. (1959). Convergent and discriminant validation by multitrait-multimethod matrix. Psychological Bulletin, 56, 81–105
13.
CliffN. (1988). The eigenvalues-greater-than-one rule and the reliability of components. Psychological Bulletin, 103, 276–279
14.
DavidsonJ. R. T.FoaE. B. (1991). Diagnostic issues in post-traumatic stress disorder: Considerations for the DSM-IV. Journal of Abnormal Psychology, 100, 346–355
15.
EverlyG. S.Jr. (1990). Post-traumatic stress disorder as a disorder of arousal. Psychology and Health, 4, 135–145
16.
FoyD. W.SipprelleR. C.RuegerD. B.CarrollE. M. (1984). Etiology of post-traumatic stress disorder in Vietnam veterans: Analysis of premilitary, military, and combat exposure influences. Journal of Consulting and Clinical Psychology, 52, 79–87
17.
HarmanH. H. (1976). Modern factor analysis (3rd ed., rev.). Chicago: University of Chicago Press
18.
HendinH.HaasA. P. (1991). Suicide and guilt as manifestations of PTSD in Vietnam combat veterans. American Journal of Psychiatry, 148, 586–591
19.
HoldenR. R.FekkenC. (1990). Structured psychopathological test item characteristics and validity. Psychological Assessment: A Journal of Consulting and Clinical Psychology, 2, 35–40
20.
HorowitzM. J.WilnerN.AlvarezW. (1979). Impact of Event Scale: A study of subjective stress. Psychosomatic Medicine, 41, 209–218
21.
HyerL.DavisH.BoudewynsP.WoodsM. G. (1991). A short form of the Mississippi Scale for Combat-Related PTSD. Journal of Clinical Psychology, 47, 510–518
22.
JacksonD. N. (1971). The dynamics of structured personality tests: 1971. Psychological Review, 78, 229–248
23.
JamesL. R.MulaikS. A.BrettJ. M. (1982). Causal analysis: Assumptions, models, and data. Beverly Hills: Sage
KeaneT. M. (1993). Symptomatology of Vietnam veterans with post-traumatic stress disorder. In DavidsonJ. R. T.FoaE. B., (Eds.), Post-traumatic stress disorder: DSM-IV and beyond (pp. 99–111). Washington, DC: American Psychiatric Press
27.
KeaneT. M.CaddellJ. M.TaylorK. L. (1988). Mississippi Scale for Combat-Related Post-traumatic Stress Disorder: Three studies in reliability and validity. Journal of Consulting and Clinical Psychology, 56, 85–90
28.
KeaneT. M.MalloyP. F.FairbankJ. A. (1984). Empirical development of an MMPI subscale of assessment of combat-related post-traumatic stress disorder. Journal of Consulting and Clinical Psychology, 52, 888–891
29.
KingD. W.KingL. A.FairbankJ. A.SchlengerW. E.SurfaceC. R. (1993). Enhancing the precision of the Mississippi Scale for combat-related post-traumatic stress disorder: An application of item response theory. Psychological Assessment, 5, 457–471
30.
KingD. W.KingL. A.GudanowskiD. M.VrevenD. L. (1993, October). Factorial validity of the civilian version of the Mississippi Scale. Paper presented at the annual meeting of the International Society for Traumatic Stress Studies, San Antonio, TX
31.
KuhneA.BaragaE.CzekalaJ. (1988). Completeness and internal consistency of DSM-III criteria for post-traumatic stress disorder. Journal of Clinical Psychology44, 717–722
32.
KulkaR. A.SchlengerW. E.FairbankJ. A.HoughR. L.JordanB. K.MarmarC. R.WeissD. S. (1990a). The National Vietnam Veterans Readjustment Study: Tables of findings and technical appendices. New York: Brunner/Mazel
33.
KulkaR. A.SchlengerW. E.FairbankJ. A.HoughR. L.JordonB. K.MarmarC. R.WeissD. S. (1990b). Trauma and the Vietnam war generation: Report on the findings from the National Vietnam Veterans Readjustment Study. New York: Brunner/Mazel
34.
LitzB. (1992). Emotional numbing in combat-related post-traumatic stress disorder: A critical review and reformulation. Clinical Psychology Review, 12, 417–432
35.
MacCallumR. C.RoznowskiMNecowitzL. B. (1992). Model modifications in covariance structure analysis: The problem of capitalization on chance. Psychological Bulletin, 111, 490–504
36.
MarchJ. S. (1990). The nosology of post-traumatic stress disorder. Journal of Anxiety Disorders, 4, 61–82
37.
MardiaK. V. (1985). Mardia's test of multinormality. In KotzS.JohnsonN. L., (Eds.), Encyclopedia of statistical sciences (Vol. 5, pp. 217–221). New York: Wiley
38.
MarshH. W. (1985). The structure of masculinity/femininity: An application of confirmatory factor analysis to higher-order factor structures and factorial invariance. Multivariate Behavioral Research, 20, 427–449
39.
MarshH. W. (1994). Confirmatory factor analysis models of factorial invariance: A multifaceted approach. Structural Equation Modeling: A Multidisciplinary Journal, 1, 5–34
40.
MarshH. W.BarnesJ.CairnsL.TidmanM. (1984). Self-description Questionnaire: Age and sex effects in the structure and level of self-concept for preadolescent children. Journal of Educational Psychology, 76, 940–956
41.
MarshH. W.HocevarD. (1985). Application of confirmatory factor analysis to the study of self-concept: First-and higher-order factor models and their invariance across groups. Psychological Bulletin, 97, 562–582
42.
MarshH. W.HocevarD. (1988). A new, more powerful approach to multitrait-multimethod analyses: Application of second-order confirmatory factor analysis. Journal of Applied Psychology, 73, 107–117
43.
MarshH. W.RichardsG. E. (1987). The multidimensionality of the Rotter I-E Scale and its higher-order structure: An application of confirmatory factor analysis. Multivariate Behavioral Research, 22, 39–69
44.
McFallM. E.MurburgM. M.SmithD. E.JensenC. F. (1991). An analysis of criteria used by VA clinicians to diagnose combat-related PTSD. Journal of Traumatic Stress, 4, 123–136
45.
McFallM. E.SmithD. S.MacKayP. W.TarverD. J. (1990). Reliability and validity of the Mississippi Scale for Combat-Related Post-Traumatic Stress Disorder. Psychological Assessment: A Journal of Consulting and Clinical Psychology, 2, 114–121
46.
McFallM. E.SmithD. S.RoszellD. K.TarverD. J.MalasK. L. (1990). Convergent validity of measures of PTSD in Vietnam combat veterans. American Journal of Psychiatry, 147, 645–648
47.
MorrisR. J.BerganJ. R.FulginitiJ. V. (1991). Structural equation modeling in clinical assessment research with children. Journal of Consulting and Clinical Psychology, 59, 371–379
48.
MulaikS.JamesL.VanAlstineJ.BennettN.LindS.StilwellC. (1989). Evaluation of goodness-of-fit indices for structural equation models. Psychological Bulletin, 105, 430–445
49.
NunnallyJ. (1978). Psychometric theory. New York: McGraw-Hill
50.
O'DonohueW.ElliottA. (1992). The current status of post-traumatic stress disorder as a diagnostic category: Problems and proposals. Journal of Traumatic Stress, 5, 421–439
51.
ReckaseM. D. (1979). Unifactor latent trait models applied to multifactor tests: Results and implications. Journal of Educational Statistics, 4, 207–230
52.
RobinsL. N.HelzerJ. E.CroughanJ.RatcliffK. S. (1981). National Institute of Mental Health Diagnostic Interview Schedule: Its history, characteristics, and validity. Archives of General Psychiatry, 38, 318–389
53.
SilverS. M.IaconoC. U. (1984). Factor-analytic support for DSM-III's post-traumatic stress disorder for Vietnam veterans. Journal of Clinical Psychology, 40, 5–14
54.
SpitzerR. L.WilliamsJ. B.GibbonM. (1987). Structured Clinical Interview for DSM-III-R-Patient Version (SCID-P, 4–1–87). New York: New York State Psychiatric Institute
55.
SteigerJ. H. (1990). Structural model evaluation and modification: An interval estimation approach. Multivariate Behavioral Research, 25, 173–180
56.
ThompsonB.BorelloG. M. (1986). Second-order factor structure of the MBTI: A construct validity assessment. Measurement and Evaluation in Counseling and Development, 18, 148–153
57.
ThompsonB.BorelloG. M. (1992). Measuring second-order factors using confirmatory methods: An illustration with the Hendrick-Hendrick love instrument. Educational and Psychological Measurement, 52, 69–77
58.
TuckerL. R.LewisC. (1973). A reliability coefficient for maximum likelihood factor analysis. Psychometrika, 38, 1–10
59.
WatsonC. G.KucalaT.JubaM.ManifoldV.AndersonP. E. D.AndersonD. (1991). A factor analysis of the DSM-III post-traumatic stress disorder criteria. Journal of Clinical Psychology, 47, 205–214
60.
WeathersF. W.LitzB. T. (1993, August). Symptom patterns in combat-related PTSD: Clinical versus community samples. Paper presented at the annual meeting of the American Psychological Association, Toronto
61.
WidigerT. A. (1992, August). DSM-IV field trials: Part I. Symposium presented at the annual meeting of the American Psychological Association, Washington, DC
