Cited by 649Schizophrenia research and treatmentMental Health and PsychiatryBipolar Disorder and Treatment

Natural Course of Schizophrenic Disorders: A 15-Year Followup of a Dutch Incidence Cohort

Wiersma, D., Nienhuis, F. J., Slooff, C. J., Giel, R.·1998·Schizophrenia Bulletin

Abstract

Data are presented on the 15-year natural course of schizophrenia and other nonaffective functional psychoses in a cohort of 82 first-contact cases from a circumscribed area in the Netherlands. The subjects were suffering from functional psychosis with International Classification of Diseases-Ninth Revision (ICD-9) diagnoses 295, 297, or 298.3-9 (broad definition of schizophrenia) on entry. Standardized assessments of psychopathology, psychological impairments, negative symptomatology, social disability, and use of mental healthcare were used. The study reveals a pattern of chronicity and relapses with a high risk of suicide: Two-thirds of the subjects had at least one relapse and after each relapse 1 of 6 subjects did not remit from the episode; 1 of 10 committed suicide; and 1 of 7 had at least one episode with affective psychotic symptoms that started on average 6 years after the onset of the schizophrenic disorder. Diagnoses were reclassified in five patients, according to DSM-III-R criteria for a bipolar disorder. The predictive power--in terms of time in psychosis and in partial or full remission--of demographic, illness, and treatment variables at onset of the illness was very limited. Insidious onset and delays in mental health treatment are risk factors that predict a longer duration of first or subsequent episodes. The importance of mental health treatment in regard to outcome is probably subject to change because an early warning and intervention strategy could prevent further damage and deterioration. Our data support the need for an adequate relapse prevention program as a priority for our mental health services.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1093/oxfordjournals.schbul.a033315

Cites

38 of 38 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Relapses may lead to reduced response to previously effective antipsychotics, potentially contributing to treatment resistance.

    “Relapses may also lead to reduced response to previously effective antipsychotics, potentially contributing to treatment resistance [10–12].”

    From Pharmacokinetic Characteristics of Long-Acting Injectable Antipsychotics for Schizophrenia: An Overview (2021) · cites this paper as [10]

    The Results section reports that the probability of chronicity increased with successive episodes, supporting the broader concern that relapses may be followed by deterioration. But it attributes that increase to negative symptoms, not reduced response to previously effective antipsychotics; the paper does not establish the proposed treatment-resistance mechanism. Page numbers were not available in our copy. (LLM, conf=0.83)

    Experimental — accuracy not yet measured

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Research works printed but not linked: 4

  1. Eaton, W.W.; Bilker, W.; Haro, J.M.; Hen-man, H.; Mortensen, P.B.; Freeman, H.; and Burgess, P. Long-term course of hospitalization for schizophrenia: Part II. Change with passage of time. Schizophrenia Bulletin, 18(2):229-241, 1992.
  2. Engelhardt, D.M.; Rosen, B.; Feldman, J.; Engelhardt, J.A.; and Cohen, P. A 15-year follow-up of 646 schizo- phrenic outpatients. Schizophrenia Bulletin, 8(3):493- 503, 1982.
  3. Hogarty, G.E. Prevention of relapse in schizophrenia. Journal of Clinical Psychiatry, 54(Suppl. 3):18-23, 1993.
  4. Wing, J.K.; Cooper, J.E.; and Sartorius, N. The Measure- ment and Classification of Psychiatric Symptoms. Cambridge, England: Cambridge University Press, 1974.

Cited by

Sorted by citations

Authors
Wiersma, D., Nienhuis, F. J., Slooff, C. J., & Giel, R.
Affiliations
University of Groningen (NL)
Corresponding author
Wiersma, D.
Venue
Schizophrenia Bulletin
Published
1998-01-01
Volume
24
Issue
1
Pages
75-85
ISSN
  • 0586-7614 (ISSN-L)
  • 1745-1701
OpenAlex
W2121119246
Cited by
649
References
38
Citations by year
2026: 8 · 2025: 12 · 2024: 14 · 2023: 14 · 2022: 18 · 2021: 17 · 2020: 56 · 2019: 38 · 2018: 24 · 2017: 26 · 2016: 62 · 2015: 22 · 2014: 34 · 2013: 28 · 2012: 15
FWCI
8.73
Type
journal article
Language
en
Open access
closed
Locations
  • Schizophrenia Bulletin (publishedVersion)
  • PubMed (publishedVersion)
  • University of Groningen research database (University of Groningen / Centre for Information Technology) (publishedVersion)
  • University of Groningen research database (University of Groningen / Centre for Information Technology) (submittedVersion)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Schizophrenia research and treatment
  • Social Sciences › Arts and Humanities › Philosophy › Mental Health and Psychiatry
  • Health Sciences › Medicine › Psychiatry and Mental health › Bipolar Disorder and Treatment
Keywords
schizophrenia
MeSH terms
Suicide Prevention, Activities of Daily Living, Adolescent, Adult, Chronic Disease, Female, Follow-Up Studies, Humans, Male, Middle Aged, Netherlands, Psychiatric Status Rating Scales, Recurrence, Rehabilitation, Vocational, Schizophrenia, Schizophrenic Psychology, Suicide, Cohort Studies, Incidence, Disease Progression

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review