Individual participant data

Individual participant data (also known as individual patient data, often abbreviated IPD) is raw data from individual participants, and is often used in the context of meta-analysis.

The International Committee of Medical Journal Editors (ICMJE) has stated that sharing of deidentified individual participant data is an ethical obligation.[1]

## IPD meta-analysis

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In an IPD meta-analysis, patient-level data from multiple studies or settings are combined to address a certain research question. IPD meta-analyses tend to be common for large-scale and international projects, and they are less limited than aggregate data (AD) meta-analyses in terms of the availability and quality of data they can use.[2] Due to the high level of precision and consistency this approach allows for (which in turn makes it easier for researchers to minimize heterogeneity), it is considered the gold standard of evidence synthesis.[3]

Common aims for an IPD meta-analysis are

* to evaluate the safety or efficacy of medical interventions [4]
* to identify modifiers of treatment effect
* to evaluate the accuracy of diagnostic tests
* to evaluate the association of prognostic markers [5]
* to develop multivariable prediction models (rules) [5]
* to evaluate the predictive performance of prognostic models [5]

Over the past few decades, meta-analyses conducted with IPD (also known as IPD meta-analyses) have become increasingly popular.[6]

## References

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1. ^ Taichman, Darren B.; Backus, Joyce; Baethge, Christopher; Bauchner, Howard; de Leeuw, Peter W.; Drazen, Jeffrey M.; Fletcher, John; Frizelle, Frank A.; Groves, Trish; Haileamlak, Abraham; James, Astrid; Laine, Christine; Peiperl, Larry; Pinborg, Anja; Sahni, Peush; Wu, Sinan (2016). "Sharing Clinical Trial Data: A Proposal From the International Committee of Medical Journal Editors". Annals of Internal Medicine. 164 (7): 127–128\. doi:10.7326/M15-2928. ISSN 0003-4819. PMC 4799536. PMID 26830980.
2. ^ Tierney, Jayne F.; Pignon, Jean-Pierre; Gueffyier, Francois; Clarke, Mike; Askie, Lisa; Vale, Claire L.; Burdett, Sarah (November 2015). "How individual participant data meta-analyses have influenced trial design, conduct, and analysis". Journal of Clinical Epidemiology. 68 (11): 1325–1335\. doi:10.1016/j.jclinepi.2015.05.024. PMC 4635379. PMID 26186982.
3. ^ Thomas, Doneal; Radji, Sanyath; Benedetti, Andrea (19 June 2014). "Systematic review of methods for individual patient data meta- analysis with binary outcomes". BMC Medical Research Methodology. 14 (1): 79. doi:10.1186/1471-2288-14-79. PMC 4074845. PMID 24943877.
4. ^ Tierney, Jayne F.; Vale, Claire; Riley, Richard; Smith, Catrin Tudur; Stewart, Lesley; Clarke, Mike; Rovers, Maroeska (2015-07-21). "Individual Participant Data (IPD) Meta-analyses of Randomised Controlled Trials: Guidance on Their Use". PLOS Medicine. 12 (7): e1001855. doi:10.1371/journal.pmed.1001855. ISSN 1549-1676. PMC 4510878. PMID 26196287.
5. ^ a b c Debray, Thomas P. A.; Riley, Richard D.; Rovers, Maroeska M.; Reitsma, Johannes B.; Moons, Karel G. M.; Group, Cochrane IPD Meta-analysis Methods (2015-10-13). "Individual Participant Data (IPD) Meta-analyses of Diagnostic and Prognostic Modeling Studies: Guidance on Their Use". PLOS Medicine. 12 (10): e1001886. doi:10.1371/journal.pmed.1001886. ISSN 1549-1676. PMC 4603958. PMID 26461078. `{{cite journal}}`: `|last6=` has generic name (help)
6. ^ Riley, R. D.; Lambert, P. C.; Abo-Zaid, G. (5 February 2010). "Meta-analysis of individual participant data: rationale, conduct, and reporting". BMJ. 340 (feb05 1): c221. doi:10.1136/bmj.c221. PMID 20139215.

## External links

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* Individual participant data meta-analysis information at the Cochrane website

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