Diversity and Participation in Clinical Trials
Summary
Diversity and participation in clinical trials concern the fair inclusion of participants across demographic, socioeconomic and geographic spectra to ensure that research findings are generalisable and equitable. Historically, many trials have under-represented women, older adults, ethnic minorities and populations in low- and middle-income regions, leading to gaps in safety, efficacy and dosing data. Growing recognition of these gaps has prompted regulatory guidance, funder mandates and community engagement initiatives aimed at broadening eligibility criteria, tailoring recruitment materials, and forging partnerships with patient advocacy groups. Technological advances—such as digital platforms for remote consent and wearable devices for home monitoring—offer further promise for reaching under-served populations. Improving diversity not only enhances social justice but also strengthens scientific validity by capturing a wider range of genetic, environmental and behavioural factors. Strategic planning of recruitment, culturally sensitive communication and adaptive trial designs are now central to efforts that seek to overcome logistical, ethical and trust-based barriers. The global imperative is to embed inclusive practices throughout trial life cycles, from protocol development through dissemination of results, thereby ensuring that all populations benefit from advances in medical science.
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Diversity and Participation in Clinical Trials publication trend
The graph below shows the total number of articles in diversity and participation in clinical trials across all publications each year (not limited to Nature Index journals).
Technical terms
Randomised Controlled Trial (RCT): A study design in which participants are assigned by chance to receive one of several interventions, enabling unbiased comparison of outcomes.
Recruitment strategies: Methods employed to identify, approach and enrol eligible participants, including community outreach, digital advertising and incentives.
Retention strategies: Techniques to maintain participants’ engagement throughout a trial, such as reminders, flexible scheduling and barrier-reduction tactics.
Under-representation: The exclusion or low enrolment of certain demographic groups in trials, leading to limited applicability of findings.
Barrier-reduction strategies: Interventions aimed at minimising logistical, financial or cultural obstacles to trial participation, for example by providing transport vouchers or multilingual materials.
References
- Reaching the hard-to-reach: a systematic review of strategies for improving health and medical research with socially disadvantaged groups. BMC Medical Research Methodology (2014).
- Barriers for conducting clinical trials in developing countries- a systematic review. International Journal for Equity in Health (2018).
- Diversity in Clinical and Biomedical Research: A Promise Yet to Be Fulfilled. PLOS Medicine (2015).
- Digitizing clinical trials. npj Digital Medicine (2020).
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