The validity of the DSM-IV diagnostic classification system of non-affective psychoses

Nikie Korver-Nieberg; Piotr J. Quee; Heleen B. M. Boos; C. Simons; Rene S. Kahn; Wiepke Cahn; Don H. Linszen; Lieuwe de Haan; Jim van Os; Lydia Krabbendam; Inez Myin-Germeys; Durk Wiersma; Richard Bruggemen; S. E. van den Berg; C. L. A. Schroeder; R. van der Valk; N. Dekker; Carin J. Meijer; L. N. Boyette; J. Meijer; D. van Dam; I. de Rijke; S. Huinink; Sanne I. de Vries; M. Jansen; D. Bos; W. P. Hoen; E. M. te West; S. H. J. Groeneveld; E. M. Vergunst; Marije Swets; S. Vothknecht; I. Poleacov; D. van Dijk; D. Spruijt-Metz; M. T. Hasty; G. Geertsa; P. M. de Baaij; A. Metzger; Nico J. M. van Beveren; M. Baldini; F. D. Grimbergen; M. A. M. Boerma; C. Agsteribbe; H. P. Wisman; M. A. H. Monden; M. Bosman; M. van Dijk; Rianne M. C. Klaassen; M. T. C. Tang; L. B. Luteijn; H. Winkel; H. Weisz; A. C. P. Strater; A. Landman; Marc A. T. M. Vorstenbosch; D. Op 't Eijnde; K. Lenders; S. Loyen; R. Roberts; Kim Sweers; H. Gielen; N. Soons; A. Hintzen; C.D. Habets van der Poel; I. Riske; C. Vossen; E. Martens; S. Apers; L. Wijnhoven; E. Konings; T. Lataster; M. Lardinois; D. Versmissen; C. Simons; M. van der Werf; P. Habets; S. Pfeifer; E. de Loore; M. Heins; M. Oorschot; M. Meys; M. Dietvorst; C. van Zelst; I. Crolla; Ron Mengelers; F. van Goethem; W. Beuken; D. Byniam; T. Driesen; M. Marcelis; G. Driessen; A. Shazad; R. van Winkel; C. Henquet; G. Kenis; P. Delespaul; P. Anema; E. M. J. van Baaren; S. C. Bakker; E. Caspers; Eske M. Derks; S. van Hemert; A. Hemkes; Ron Hijman; M. van Leeuwen; J. E. H. Machielsen; Roel A. Ophoff; M. Rais; M. Salden; H. van Someren; E. Strengman; M. Vleesschouwer; M. van Beek; P. N. van Harten; Jeroen P. F. Koning; W. Schep; M. G. Vollema; Bram P Prins; T. Viester; A. Akdeniz; K. Verweij; K. Kaymaz; Frank Van den Heuvel; B. Van der Goot; J.E. Hovens; A. J. M. Loonen; J. Bous; M. Veenstra; E. van 't Hag; F. J. Nienhuis; H. G. O. M. Smid; E. Veermans; Agna A. Bartels-Velthuis; F. Duijndam; T. Lugtenberg; Henderikus Knegtering; W. Blaauw; A. Wunderink; K. P. Touw; J. Arends; Cees J. Slooff; J. Brilman; M. Schomaker; Michiel van Wijk; A. Wessels; E. Vroom; K. Meijerink; I. Bogert; W. Janssen; Inge A. H. van den Berk; E.O. Noorthoorn van der Kruijff; Helga K. Ising; Jan Dirk Blom; Mark van der Gaag; G. Mensen; R. van der Snoek; R. Smit; G. Faber

doi:10.3109/00048674.2011.620562

The validity of the DSM-IV diagnostic classification system of non-affective psychoses

Nikie Korver-Nieberg^*, Piotr J. Quee, Heleen B. M. Boos, C. Simons, Rene S. Kahn, Wiepke Cahn, Don H. Linszen, Lieuwe de Haan, Jim van Os, Lydia Krabbendam, Inez Myin-Germeys, Durk Wiersma, Richard Bruggemen, S. E. van den Berg, C. L. A. Schroeder, R. van der Valk, N. Dekker, Carin J. Meijer, L. N. Boyette, J. MeijerD. van Dam, I. de Rijke, S. Huinink, Sanne I. de Vries, M. Jansen, D. Bos, W. P. Hoen, E. M. te West, S. H. J. Groeneveld, E. M. Vergunst, Marije Swets, S. Vothknecht, I. Poleacov, D. van Dijk, D. Spruijt-Metz, M. T. Hasty, G. Geertsa, P. M. de Baaij, A. Metzger, Nico J. M. van Beveren, M. Baldini, F. D. Grimbergen, M. A. M. Boerma, C. Agsteribbe, H. P. Wisman, M. A. H. Monden, M. Bosman, M. van Dijk, Rianne M. C. Klaassen, M. T. C. Tang, L. B. Luteijn, H. Winkel, H. Weisz, A. C. P. Strater, A. Landman, Marc A. T. M. Vorstenbosch, D. Op 't Eijnde, K. Lenders, S. Loyen, R. Roberts, Kim Sweers, H. Gielen, N. Soons, A. Hintzen, C.D. Habets van der Poel, I. Riske, C. Vossen, E. Martens, S. Apers, L. Wijnhoven, E. Konings, T. Lataster, M. Lardinois, D. Versmissen, C. Simons, M. van der Werf, P. Habets, S. Pfeifer, E. de Loore, M. Heins, M. Oorschot, M. Meys, M. Dietvorst, C. van Zelst, I. Crolla, Ron Mengelers, F. van Goethem, W. Beuken, D. Byniam, T. Driesen, M. Marcelis, G. Driessen, A. Shazad, R. van Winkel, C. Henquet, G. Kenis, P. Delespaul, P. Anema, E. M. J. van Baaren, S. C. Bakker, E. Caspers, Eske M. Derks, S. van Hemert, A. Hemkes, Ron Hijman, M. van Leeuwen, J. E. H. Machielsen, Roel A. Ophoff, M. Rais, M. Salden, H. van Someren, E. Strengman, M. Vleesschouwer, M. van Beek, P. N. van Harten, Jeroen P. F. Koning, W. Schep, M. G. Vollema, Bram P Prins, T. Viester, A. Akdeniz, K. Verweij, K. Kaymaz, Frank Van den Heuvel, B. Van der Goot, J.E. Hovens, A. J. M. Loonen, J. Bous, M. Veenstra, E. van 't Hag, F. J. Nienhuis, H. G. O. M. Smid, E. Veermans, Agna A. Bartels-Velthuis, F. Duijndam, T. Lugtenberg, Henderikus Knegtering, W. Blaauw, A. Wunderink, K. P. Touw, J. Arends, Cees J. Slooff, J. Brilman, M. Schomaker, Michiel van Wijk, A. Wessels, E. Vroom, K. Meijerink, I. Bogert, W. Janssen, Inge A. H. van den Berk, E.O. Noorthoorn van der Kruijff, Helga K. Ising, Jan Dirk Blom, Mark van der Gaag, G. Mensen, R. van der Snoek, R. Smit, G. Faber

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

Objective: The schizophrenia and other non-affective disorders categories listed in the DSM-IV, are currently under revision for the development of the fifth edition. The aim of the present study is to demonstrate the validity of these categories by investigating possible differences between diagnostic patient subgroups on various measures. Methods: 1064 patients with a diagnosis of non-affective psychosis (schizophrenia N = 731 (paranoid type 82%), schizoaffective N = 63, schizophreniform N = 120, psychosis not otherwise specified/brief psychotic disorder N = 150) participated in this study. Dependent variables were demographic and clinical characteristics, severity of psychopathology, premorbid and current functioning, and indicators of quality of life. Results: Within the diagnostic group of schizophrenia, no significant differences were observed between paranoid schizophrenia, disorganized, and undifferentiated schizophrenia. Patients with schizophrenia experienced more severe psychopathology and had poorer levels of current functioning compared to patients with psychosis not otherwise specified or brief psychotic disorder. Differences between schizophrenia and schizoaffective disorder were less clear. Conclusion: Our results do not support the validity of schizophrenia subtypes. Schizophrenia can be distinguished from brief psychotic disorder and psychotic disorder not otherwise specified. These findings may fuel the actual DSM-V discussion.

Original language	English
Pages (from-to)	1061-1068
Journal	Australian and New Zealand Journal of Psychiatry
Volume	45
Issue number	12
DOIs	https://doi.org/10.3109/00048674.2011.620562
Publication status	Published - Dec 2011

Keywords

categorization
DSM-V
schizophrenia
subtypes
validity

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10.3109/00048674.2011.620562

Cite this

Korver-Nieberg, N., Quee, P. J., Boos, H. B. M., Simons, C., Kahn, R. S., Cahn, W., Linszen, D. H., de Haan, L., van Os, J., Krabbendam, L., Myin-Germeys, I., Wiersma, D., Bruggemen, R., van den Berg, S. E., Schroeder, C. L. A., van der Valk, R., Dekker, N., Meijer, C. J., Boyette, L. N., ... Faber, G. (2011). The validity of the DSM-IV diagnostic classification system of non-affective psychoses. Australian and New Zealand Journal of Psychiatry, 45(12), 1061-1068. https://doi.org/10.3109/00048674.2011.620562

@article{428faef0baeb4f50864c2c302cb7ddab,

title = "The validity of the DSM-IV diagnostic classification system of non-affective psychoses",

abstract = "Objective: The schizophrenia and other non-affective disorders categories listed in the DSM-IV, are currently under revision for the development of the fifth edition. The aim of the present study is to demonstrate the validity of these categories by investigating possible differences between diagnostic patient subgroups on various measures. Methods: 1064 patients with a diagnosis of non-affective psychosis (schizophrenia N = 731 (paranoid type 82%), schizoaffective N = 63, schizophreniform N = 120, psychosis not otherwise specified/brief psychotic disorder N = 150) participated in this study. Dependent variables were demographic and clinical characteristics, severity of psychopathology, premorbid and current functioning, and indicators of quality of life. Results: Within the diagnostic group of schizophrenia, no significant differences were observed between paranoid schizophrenia, disorganized, and undifferentiated schizophrenia. Patients with schizophrenia experienced more severe psychopathology and had poorer levels of current functioning compared to patients with psychosis not otherwise specified or brief psychotic disorder. Differences between schizophrenia and schizoaffective disorder were less clear. Conclusion: Our results do not support the validity of schizophrenia subtypes. Schizophrenia can be distinguished from brief psychotic disorder and psychotic disorder not otherwise specified. These findings may fuel the actual DSM-V discussion.",

keywords = "categorization, DSM-V, schizophrenia, subtypes, validity",

author = "Nikie Korver-Nieberg and Quee, {Piotr J.} and Boos, {Heleen B. M.} and C. Simons and Kahn, {Rene S.} and Wiepke Cahn and Linszen, {Don H.} and {de Haan}, Lieuwe and {van Os}, Jim and Lydia Krabbendam and Inez Myin-Germeys and Durk Wiersma and Richard Bruggemen and {van den Berg}, {S. E.} and Schroeder, {C. L. A.} and {van der Valk}, R. and N. Dekker and Meijer, {Carin J.} and Boyette, {L. N.} and J. Meijer and {van Dam}, D. and {de Rijke}, I. and S. Huinink and {de Vries}, {Sanne I.} and M. Jansen and D. Bos and Hoen, {W. P.} and {te West}, {E. M.} and Groeneveld, {S. H. J.} and Vergunst, {E. M.} and Marije Swets and S. Vothknecht and I. Poleacov and {van Dijk}, D. and D. Spruijt-Metz and Hasty, {M. T.} and G. Geertsa and {de Baaij}, {P. M.} and A. Metzger and {van Beveren}, {Nico J. M.} and M. Baldini and Grimbergen, {F. D.} and Boerma, {M. A. M.} and C. Agsteribbe and Wisman, {H. P.} and Monden, {M. A. H.} and M. Bosman and {van Dijk}, M. and Klaassen, {Rianne M. C.} and Tang, {M. T. C.} and Luteijn, {L. B.} and H. Winkel and H. Weisz and Strater, {A. C. P.} and A. Landman and Vorstenbosch, {Marc A. T. M.} and {Op 't Eijnde}, D. and K. Lenders and S. Loyen and R. Roberts and Kim Sweers and H. Gielen and N. Soons and A. Hintzen and {Habets van der Poel}, C.D. and I. Riske and C. Vossen and E. Martens and S. Apers and L. Wijnhoven and E. Konings and T. Lataster and M. Lardinois and D. Versmissen and C. Simons and {van der Werf}, M. and P. Habets and S. Pfeifer and {de Loore}, E. and M. Heins and M. Oorschot and M. Meys and M. Dietvorst and {van Zelst}, C. and I. Crolla and Ron Mengelers and {van Goethem}, F. and W. Beuken and D. Byniam and T. Driesen and M. Marcelis and G. Driessen and A. Shazad and {van Winkel}, R. and C. Henquet and G. Kenis and P. Delespaul and P. Anema and {van Baaren}, {E. M. J.} and Bakker, {S. C.} and E. Caspers and Derks, {Eske M.} and {van Hemert}, S. and A. Hemkes and Ron Hijman and {van Leeuwen}, M. and Machielsen, {J. E. H.} and Ophoff, {Roel A.} and M. Rais and M. Salden and {van Someren}, H. and E. Strengman and M. Vleesschouwer and {van Beek}, M. and {van Harten}, {P. N.} and Koning, {Jeroen P. F.} and W. Schep and Vollema, {M. G.} and Prins, {Bram P} and T. Viester and A. Akdeniz and K. Verweij and K. Kaymaz and {Van den Heuvel}, Frank and {Van der Goot}, B. and J.E. Hovens and Loonen, {A. J. M.} and J. Bous and M. Veenstra and {van 't Hag}, E. and Nienhuis, {F. J.} and Smid, {H. G. O. M.} and E. Veermans and Bartels-Velthuis, {Agna A.} and F. Duijndam and T. Lugtenberg and Henderikus Knegtering and W. Blaauw and A. Wunderink and Touw, {K. P.} and J. Arends and Slooff, {Cees J.} and J. Brilman and M. Schomaker and {van Wijk}, Michiel and A. Wessels and E. Vroom and K. Meijerink and I. Bogert and W. Janssen and {van den Berk}, {Inge A. H.} and {Noorthoorn van der Kruijff}, E.O. and Ising, {Helga K.} and Blom, {Jan Dirk} and {van der Gaag}, Mark and G. Mensen and {van der Snoek}, R. and R. Smit and G. Faber",

year = "2011",

month = dec,

doi = "10.3109/00048674.2011.620562",

language = "English",

volume = "45",

pages = "1061--1068",

journal = "Australian and New Zealand Journal of Psychiatry",

issn = "0004-8674",

publisher = "SAGE Publications Ltd",

number = "12",

}

Korver-Nieberg, N, Quee, PJ, Boos, HBM, Simons, C, Kahn, RS, Cahn, W, Linszen, DH, de Haan, L, van Os, J, Krabbendam, L, Myin-Germeys, I, Wiersma, D, Bruggemen, R, van den Berg, SE, Schroeder, CLA, van der Valk, R, Dekker, N, Meijer, CJ, Boyette, LN, Meijer, J, van Dam, D, de Rijke, I, Huinink, S, de Vries, SI, Jansen, M, Bos, D, Hoen, WP, te West, EM, Groeneveld, SHJ, Vergunst, EM, Swets, M, Vothknecht, S, Poleacov, I, van Dijk, D, Spruijt-Metz, D, Hasty, MT, Geertsa, G, de Baaij, PM, Metzger, A, van Beveren, NJM, Baldini, M, Grimbergen, FD, Boerma, MAM, Agsteribbe, C, Wisman, HP, Monden, MAH, Bosman, M, van Dijk, M, Klaassen, RMC, Tang, MTC, Luteijn, LB, Winkel, H, Weisz, H, Strater, ACP, Landman, A, Vorstenbosch, MATM, Op 't Eijnde, D, Lenders, K, Loyen, S, Roberts, R, Sweers, K, Gielen, H, Soons, N, Hintzen, A, Habets van der Poel, CD, Riske, I, Vossen, C, Martens, E, Apers, S, Wijnhoven, L, Konings, E, Lataster, T, Lardinois, M, Versmissen, D, Simons, C, van der Werf, M, Habets, P, Pfeifer, S, de Loore, E, Heins, M, Oorschot, M, Meys, M, Dietvorst, M, van Zelst, C, Crolla, I, Mengelers, R, van Goethem, F, Beuken, W, Byniam, D, Driesen, T, Marcelis, M, Driessen, G, Shazad, A, van Winkel, R, Henquet, C, Kenis, G, Delespaul, P, Anema, P, van Baaren, EMJ, Bakker, SC, Caspers, E, Derks, EM, van Hemert, S, Hemkes, A, Hijman, R, van Leeuwen, M, Machielsen, JEH, Ophoff, RA, Rais, M, Salden, M, van Someren, H, Strengman, E, Vleesschouwer, M, van Beek, M, van Harten, PN, Koning, JPF, Schep, W, Vollema, MG, Prins, BP, Viester, T, Akdeniz, A, Verweij, K, Kaymaz, K, Van den Heuvel, F, Van der Goot, B, Hovens, JE, Loonen, AJM, Bous, J, Veenstra, M, van 't Hag, E, Nienhuis, FJ, Smid, HGOM, Veermans, E, Bartels-Velthuis, AA, Duijndam, F, Lugtenberg, T, Knegtering, H, Blaauw, W, Wunderink, A, Touw, KP, Arends, J, Slooff, CJ, Brilman, J, Schomaker, M, van Wijk, M, Wessels, A, Vroom, E, Meijerink, K, Bogert, I, Janssen, W, van den Berk, IAH, Noorthoorn van der Kruijff, EO, Ising, HK, Blom, JD, van der Gaag, M, Mensen, G, van der Snoek, R, Smit, R & Faber, G 2011, 'The validity of the DSM-IV diagnostic classification system of non-affective psychoses', Australian and New Zealand Journal of Psychiatry, vol. 45, no. 12, pp. 1061-1068. https://doi.org/10.3109/00048674.2011.620562

TY - JOUR

T1 - The validity of the DSM-IV diagnostic classification system of non-affective psychoses

AU - Korver-Nieberg, Nikie

AU - Quee, Piotr J.

AU - Boos, Heleen B. M.

AU - Simons, C.

AU - Kahn, Rene S.

AU - Cahn, Wiepke

AU - Linszen, Don H.

AU - de Haan, Lieuwe

AU - van Os, Jim

AU - Krabbendam, Lydia

AU - Myin-Germeys, Inez

AU - Wiersma, Durk

AU - Bruggemen, Richard

AU - van den Berg, S. E.

AU - Schroeder, C. L. A.

AU - van der Valk, R.

AU - Dekker, N.

AU - Meijer, Carin J.

AU - Boyette, L. N.

AU - Meijer, J.

AU - van Dam, D.

AU - de Rijke, I.

AU - Huinink, S.

AU - de Vries, Sanne I.

AU - Jansen, M.

AU - Bos, D.

AU - Hoen, W. P.

AU - te West, E. M.

AU - Groeneveld, S. H. J.

AU - Vergunst, E. M.

AU - Swets, Marije

AU - Vothknecht, S.

AU - Poleacov, I.

AU - van Dijk, D.

AU - Spruijt-Metz, D.

AU - Hasty, M. T.

AU - Geertsa, G.

AU - de Baaij, P. M.

AU - Metzger, A.

AU - van Beveren, Nico J. M.

AU - Baldini, M.

AU - Grimbergen, F. D.

AU - Boerma, M. A. M.

AU - Agsteribbe, C.

AU - Wisman, H. P.

AU - Monden, M. A. H.

AU - Bosman, M.

AU - van Dijk, M.

AU - Klaassen, Rianne M. C.

AU - Tang, M. T. C.

AU - Luteijn, L. B.

AU - Winkel, H.

AU - Weisz, H.

AU - Strater, A. C. P.

AU - Landman, A.

AU - Vorstenbosch, Marc A. T. M.

AU - Op 't Eijnde, D.

AU - Lenders, K.

AU - Loyen, S.

AU - Roberts, R.

AU - Sweers, Kim

AU - Gielen, H.

AU - Soons, N.

AU - Hintzen, A.

AU - Habets van der Poel, C.D.

AU - Riske, I.

AU - Vossen, C.

AU - Martens, E.

AU - Apers, S.

AU - Wijnhoven, L.

AU - Konings, E.

AU - Lataster, T.

AU - Lardinois, M.

AU - Versmissen, D.

AU - Simons, C.

AU - van der Werf, M.

AU - Habets, P.

AU - Pfeifer, S.

AU - de Loore, E.

AU - Heins, M.

AU - Oorschot, M.

AU - Meys, M.

AU - Dietvorst, M.

AU - van Zelst, C.

AU - Crolla, I.

AU - Mengelers, Ron

AU - van Goethem, F.

AU - Beuken, W.

AU - Byniam, D.

AU - Driesen, T.

AU - Marcelis, M.

AU - Driessen, G.

AU - Shazad, A.

AU - van Winkel, R.

AU - Henquet, C.

AU - Kenis, G.

AU - Delespaul, P.

AU - Anema, P.

AU - van Baaren, E. M. J.

AU - Bakker, S. C.

AU - Caspers, E.

AU - Derks, Eske M.

AU - van Hemert, S.

AU - Hemkes, A.

AU - Hijman, Ron

AU - van Leeuwen, M.

AU - Machielsen, J. E. H.

AU - Ophoff, Roel A.

AU - Rais, M.

AU - Salden, M.

AU - van Someren, H.

AU - Strengman, E.

AU - Vleesschouwer, M.

AU - van Beek, M.

AU - van Harten, P. N.

AU - Koning, Jeroen P. F.

AU - Schep, W.

AU - Vollema, M. G.

AU - Prins, Bram P

AU - Viester, T.

AU - Akdeniz, A.

AU - Verweij, K.

AU - Kaymaz, K.

AU - Van den Heuvel, Frank

AU - Van der Goot, B.

AU - Hovens, J.E.

AU - Loonen, A. J. M.

AU - Bous, J.

AU - Veenstra, M.

AU - van 't Hag, E.

AU - Nienhuis, F. J.

AU - Smid, H. G. O. M.

AU - Veermans, E.

AU - Bartels-Velthuis, Agna A.

AU - Duijndam, F.

AU - Lugtenberg, T.

AU - Knegtering, Henderikus

AU - Blaauw, W.

AU - Wunderink, A.

AU - Touw, K. P.

AU - Arends, J.

AU - Slooff, Cees J.

AU - Brilman, J.

AU - Schomaker, M.

AU - van Wijk, Michiel

AU - Wessels, A.

AU - Vroom, E.

AU - Meijerink, K.

AU - Bogert, I.

AU - Janssen, W.

AU - van den Berk, Inge A. H.

AU - Noorthoorn van der Kruijff, E.O.

AU - Ising, Helga K.

AU - Blom, Jan Dirk

AU - van der Gaag, Mark

AU - Mensen, G.

AU - van der Snoek, R.

AU - Smit, R.

AU - Faber, G.

PY - 2011/12

Y1 - 2011/12

N2 - Objective: The schizophrenia and other non-affective disorders categories listed in the DSM-IV, are currently under revision for the development of the fifth edition. The aim of the present study is to demonstrate the validity of these categories by investigating possible differences between diagnostic patient subgroups on various measures. Methods: 1064 patients with a diagnosis of non-affective psychosis (schizophrenia N = 731 (paranoid type 82%), schizoaffective N = 63, schizophreniform N = 120, psychosis not otherwise specified/brief psychotic disorder N = 150) participated in this study. Dependent variables were demographic and clinical characteristics, severity of psychopathology, premorbid and current functioning, and indicators of quality of life. Results: Within the diagnostic group of schizophrenia, no significant differences were observed between paranoid schizophrenia, disorganized, and undifferentiated schizophrenia. Patients with schizophrenia experienced more severe psychopathology and had poorer levels of current functioning compared to patients with psychosis not otherwise specified or brief psychotic disorder. Differences between schizophrenia and schizoaffective disorder were less clear. Conclusion: Our results do not support the validity of schizophrenia subtypes. Schizophrenia can be distinguished from brief psychotic disorder and psychotic disorder not otherwise specified. These findings may fuel the actual DSM-V discussion.

AB - Objective: The schizophrenia and other non-affective disorders categories listed in the DSM-IV, are currently under revision for the development of the fifth edition. The aim of the present study is to demonstrate the validity of these categories by investigating possible differences between diagnostic patient subgroups on various measures. Methods: 1064 patients with a diagnosis of non-affective psychosis (schizophrenia N = 731 (paranoid type 82%), schizoaffective N = 63, schizophreniform N = 120, psychosis not otherwise specified/brief psychotic disorder N = 150) participated in this study. Dependent variables were demographic and clinical characteristics, severity of psychopathology, premorbid and current functioning, and indicators of quality of life. Results: Within the diagnostic group of schizophrenia, no significant differences were observed between paranoid schizophrenia, disorganized, and undifferentiated schizophrenia. Patients with schizophrenia experienced more severe psychopathology and had poorer levels of current functioning compared to patients with psychosis not otherwise specified or brief psychotic disorder. Differences between schizophrenia and schizoaffective disorder were less clear. Conclusion: Our results do not support the validity of schizophrenia subtypes. Schizophrenia can be distinguished from brief psychotic disorder and psychotic disorder not otherwise specified. These findings may fuel the actual DSM-V discussion.

KW - categorization

KW - DSM-V

KW - schizophrenia

KW - subtypes

KW - validity

U2 - 10.3109/00048674.2011.620562

DO - 10.3109/00048674.2011.620562

M3 - Article

C2 - 22026404

SN - 0004-8674

VL - 45

SP - 1061

EP - 1068

JO - Australian and New Zealand Journal of Psychiatry

JF - Australian and New Zealand Journal of Psychiatry

IS - 12

ER -