Student or educator? Sign up with your school email and get 6 months of Pro free.
Cited by 364

The DOI matches its Crossref record; 4 of the 4 references it cites were found in a registry or an index.

Content and quality of 2000 controlled trials in schizophrenia over 50 years

Open access
Thornley, B., Adams, C.·1998·BMJ

Abstract

OBJECTIVE: To provide a comprehensive survey of the content and quality of intervention studies relevant to the treatment of schizophrenia. DESIGN: Data were extracted from 2000 trials on the Cochrane Schizophrenia Group's register. MAIN OUTCOME MEASURES: Type and date of publication, country of origin, language, size of study, treatment setting, participant group, interventions, outcomes, and quality of study. RESULTS: Hospital based drug trials undertaken in the United States were dominant in the sample (54%). Generally, studies were short (54%<6 weeks), small (mean number of patients 65), and poorly reported (64% had a quality score of <=2 (maximum score 5)). Over 600 different interventions were studied in these trials, and 640 different rating scales were used to measure outcome. CONCLUSIONS: Half a century of studies of limited quality, duration, and clinical utility leave much scope for well planned, conducted, and reported trials. The drug regulatory authorities should stipulate that the results of both explanatory and pragmatic trials are necessary before a compound is given a licence for everyday use.

Overview

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 · 10.1136/bmj.317.7167.1181

Cites

4 of 4 references verified0 citation errors · 0 not checkable

Statistics

Verification

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

Self-check

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

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

Citations

Cites

Show all 4 references

Cited by

See all 364

Metadata

Authors
Thornley, B., & Adams, C.
Venue
BMJ
Publisher
BMJ
Published
1998-10-31
Volume
317
Issue
7167
Pages
1181-1184
ISSN
  • 0007-1447 (ISSN-L)
  • 0959-8138
  • 1468-5833
OpenAlex
W2110841701
Cited by
364
References
4
FWCI
14.15
Type
journal article
Language
en
Open access
bronze

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

How to cite

Cite CoChat for the checks on this page, and the paper for its own findings.

This page
CoChat. (2026). Citation check: Content and quality of 2000 controlled trials in schizophrenia over 50 years. https://app.cochat.ai/papers/10.1136/bmj.317.7167.1181
The paper
Thornley, B., & Adams, C. (1998). Content and quality of 2000 controlled trials in schizophrenia over 50 years. BMJ. https://doi.org/10.1136/bmj.317.7167.1181

Data sources

Bibliographic data: Semantic Scholar, OpenAlex, Crossref.

Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.