# Setting number of decimal places for reporting risk ratios: rule of four

```@article{Cole2015SettingNO,
title={Setting number of decimal places for reporting risk ratios: rule of four},
author={Tim James Cole},
journal={BMJ : British Medical Journal},
year={2015},
volume={350}
}```
• T. Cole
• Published 27 April 2015
• BMJ : British Medical Journal
Summary statistics are often reported to too many or, less often, too few decimal places. The rule of four provides a simple framework to guide authors in the appropriate number of decimal places to use when reporting risk ratios
21 Citations
Goldilocks Rounding: Achieving Balance Between Accuracy and Parsimony in the Reporting of Relative Effect Estimates
When presenting the findings of a study, authors need to be careful that they do not report numbers that contain too few significant digits and should avoid providing more significant figures than are warranted to convey the underlying meaning of the result.
Missing the point: are journals using the ideal number of decimal places?
Using the recommended number of decimal places would make papers easier to read and reduce the burden on readers, and potentially improve comprehension.
Missing the point: are journals using the ideal number of decimal places?
Using the recommended number of decimal places would make papers easier to read and reduce the burden on readers, and potentially improve comprehension.
Too many digits: the presentation of numerical data
• T. Cole
• Education
Archives of Disease in Childhood
• 2015
It concerns me that numbers are often reported to excessive precision, because too many digits can swamp the reader, overcomplicate the story and obscure the message.
How many of the digits in a mean of 12.3456789012 are worth reporting?
How the significance of a digit in a particular decade of a mean depends on the standard error of the mean (SEM) is shown and a simple evidence-based rule for the number of significant digits (‘sigdigs’) is distilled.
Promoting Recruitment using Information Management Efficiently (PRIME): statistical analysis plan for a stepped wedge cluster randomised trial within the REstart or STop Antithrombotics Randomised Trial (RESTART)
• Medicine
Trials
• 2017
The primary outcome is the total number of patients randomised into RESTART per month per site, which will be analysed in a negative binomial generalised linear mixed model and the proportion of sites using stroke databases to identify potentially eligible patients before PRIME.
Reporting uncertainty for gas certified reference materials: balancing customer requirements with calibration and measurement capabilities
Accreditation and Quality Assurance
• 2021
The effect of rounding when presenting the uncertainties associated with bespoke gas certified reference materials has been investigated. This has been examined in the context of wanting to provide

## References

SHOWING 1-10 OF 28 REFERENCES
Statistics Notes: Presentation of numerical data
• Computer Science
BMJ
• 1996
The purpose of a scientific paper is to communicate, and within the paper this applies especially to the presentation of data. Continuous data, such as serum cholesterol concentration or triceps
Too many digits: the presentation of numerical data
• T. Cole
• Education
Archives of Disease in Childhood
• 2015
It concerns me that numbers are often reported to excessive precision, because too many digits can swamp the reader, overcomplicate the story and obscure the message.
Speed of updating online evidence based point of care summaries: prospective cohort analysis
• Medicine
BMJ : British Medical Journal
• 2011
The updating speed of Dynamed clearly led the others, and a qualitative analysis of updating mechanisms is needed to determine whether greater speed corresponds to more appropriate incorporation of new information.
Tocolytic therapy for preterm delivery: systematic review and network meta-analysis
• Medicine
BMJ : British Medical Journal
• 2012
Prostaglandin inhibitors and calcium channel blockers had the highest probability of delaying delivery and improving neonatal and maternal outcomes and were the tocolytics with the best probability of being ranked in the top three medication classes for the outcomes of 48 hour delay in delivery, respiratory distress syndrome, neonatal mortality, and maternal side effects (all cause).
EASE Guidelines for Authors and Translators of Scientific Articles to be Published in English*
This concise and readable set of editorial guidelines was first published by the European Association of Science Editors (EASE) in 2010 and is updated annually and draws attention to ethical issues: authorship criteria, plagiarism, conflict of interests, etc.
Academic performance of ethnic minority candidates and discrimination in the MRCGP examinations between 2010 and 2012: analysis of data
• Medicine, Psychology
BMJ : British Medical Journal
• 2013
The difference between British black and minority ethnic candidates and British white candidates in the pass rates of the clinical skills assessment, despite controlling for prior attainment, suggests that subjective bias could also be a factor of failure.
Efficacy and safety of novel oral anticoagulants for treatment of acute venous thromboembolism: direct and adjusted indirect meta-analysis of randomised controlled trials
• Medicine
BMJ : British Medical Journal
• 2012
Compared with vitamin K antagonists, the novel oral anticoagulants had a similar risk of recurrence of acute venous thromboembolism and all cause mortality, though rivaroxaban was associated with a reduced risk of bleeding.
Risk of lung cancer associated with domestic use of coal in Xuanwei, China: retrospective cohort study
• Medicine
BMJ : British Medical Journal
• 2012
The domestic use of smoky coal is associated with a substantial increase in the absolute lifetime risk of developing lung cancer and is likely to represent one of the strongest effects of environmental pollution reported for cancer risk.
Elevated rheumatoid factor and long term risk of rheumatoid arthritis: a prospective cohort study
• Medicine
BMJ : British Medical Journal
• 2012
Individuals in the general population with elevated rheumatoid factor have up to 26-fold greater long term risk of r heumatoid arthritis, and up to 32% 10 year absolute risk of the disease.
Publication Manual of the American Psychological Association
• Psychology
Occupational therapy in health care
• 2012
The book provides stronger standards for maintaining the participant confidentiality and for reducing bias in language describing participants and suggests that researchers avoid the use of derogatory language such as using “minority” for “non-white” populations.