Student or educator? Sign up with your school email and get 6 months of Pro free.
Cited by 677

The DOI matches its Crossref record; 18 of the 18 references it cites were found in a registry or an index.

Risk of gastrointestinal haemorrhage with long term use of aspirin: meta-analysis

Open access
Derry, S.·2000·BMJ

Abstract

OBJECTIVES: To assess the incidence of gastrointestinal haemorrhage associated with long term aspirin therapy and to determine the effect of dose reduction and formulation on the incidence of such haemorrhage. DESIGN: Meta-analysis of 24 randomised controlled trials (almost 66 000 participants). INTERVENTION: Aspirin compared with placebo or no treatment, for a minimum of one year. MAIN OUTCOME MEASURES: Incidence of gastrointestinal haemorrhage. RESULTS: Gastrointestinal haemorrhage occurred in 2.47% of patients taking aspirin compared with 1.42% taking placebo (odds ratio 1.68; 95% confidence interval 1.51 to 1.88); the number needed to harm was 106 (82 to 140) based on an average of 28 months' therapy. At doses below 163 mg/day, gastrointestinal haemorrhage occurred in 2.30% of patients taking aspirin compared with 1.45% taking placebo (1.59; 1.40 to 1.81). Meta-regression showed no relation between gastrointestinal haemorrhage and dose. For modified release formulations of aspirin the odds ratio was 1.93 (1.15 to 3.23). CONCLUSIONS: Long term therapy with aspirin is associated with a significant increase in the incidence of gastrointestinal haemorrhage. No evidence exists that reducing the dose or using modified release formulations would reduce the incidence of gastrointestinal haemorrhage.

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.321.7270.1183

Cites

18 of 18 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 18 references

Cited by

See all 677

Metadata

Authors
Derry, S.
Venue
BMJ
Publisher
BMJ
Published
2000-11-11
Volume
321
Issue
7270
Pages
1183-1187
ISSN
0959-8138 (ISSN-L)
OpenAlex
W2071335057
Cited by
677
References
18
FWCI
21.39
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: Risk of gastrointestinal haemorrhage with long term use of aspirin: meta-analysis. https://app.cochat.ai/papers/10.1136/bmj.321.7270.1183
The paper
Derry, S. (2000). Risk of gastrointestinal haemorrhage with long term use of aspirin: meta-analysis. BMJ. https://doi.org/10.1136/bmj.321.7270.1183

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.