Techniques for Simplifying Informed Consent Language in Clinical Research

Why Simplification of Consent Language Matters

Informed consent documents are often written at a high reading level, filled with legal jargon and medical terminology. For participants, especially those with low literacy or from non-medical backgrounds, this creates barriers to understanding. According to ICH-GCP, informed consent must ensure that participants fully comprehend the trial’s purpose, risks, and benefits. Thus, simplifying consent language is not only an ethical requirement but also a regulatory mandate.

Readability studies show that many consent forms are written at a college reading level, while health literacy experts recommend a 6th–8th grade reading level. This mismatch can undermine participant autonomy and even risk non-compliance during audits. Ethics committees increasingly emphasize readability and participant comprehension in their reviews.

Core Principles of Simplification

• ➤ Plain Language: Replace medical jargon with everyday words. For example, use “heart attack” instead of “myocardial infarction.”
• ➤ Short Sentences: Limit sentences to 15–20 words to improve readability.
• ➤ Active Voice: Use “You will take the medicine daily” instead of “The medicine is to be taken daily.”
• ➤ Consistent Terminology: Avoid switching between synonyms for the same concept (e.g., drug, medication, treatment).
• ➤ Visual Aids: Include diagrams, flowcharts, or icons where appropriate.

Applying these techniques increases participant confidence and reduces dropout rates during clinical trials.

Using Readability Metrics

Several readability tools can help assess the language level of consent forms. Commonly used indices include:

Metric	Target Score	Compliance Indicator
Flesch Reading Ease	≥ 60	Easy to read
Flesch-Kincaid Grade Level	6–8	Participant-friendly
SMOG Index	≤ 8	Acceptable for laypersons

Regulators and IRBs may request readability assessments as part of submission packages to ensure participants are not disadvantaged by complex language.

Practical Techniques for Rewriting

Consider the following techniques when rewriting consent forms:

• Break complex procedures into step-by-step explanations
• Replace statistics with plain explanations (“1 out of 10 people may feel tired”)
• Use bullet points and headings to separate information
• Highlight key messages (risks, rights, benefits)

Example before-and-after comparison:

Case Study: Improving Consent in Oncology Trials

In a multicenter oncology trial, initial consent documents scored at a 14th-grade level. After applying simplification techniques, the documents were reduced to an 8th-grade level. Feedback from participants indicated improved comprehension, and the ethics committee approved the revised form without requests for further clarification.

Global Considerations in Simplification

International trials face challenges in ensuring readability across diverse cultures and languages:

• ➤ Translate into local languages with cultural adaptation
• ➤ Ensure terms align with literacy levels in the target population
• ➤ Pilot test forms with small groups for comprehension
• ➤ Address regional regulatory expectations (e.g., EMA emphasizes lay summaries)

Resources such as the ISRCTN Registry provide examples of plain-language summaries that align with best practices for simplifying complex trial information.

Conclusion

Simplifying informed consent language is a crucial step in enhancing transparency, ensuring ethical compliance, and empowering participants. By applying readability metrics, rewriting complex terms into plain language, and involving participants in pre-testing, sponsors and investigators can achieve both regulatory compliance and participant trust. Ultimately, informed consent should be a bridge to understanding—not a barrier.

Informed Consent Documentation Variations Across ASEAN Clinical Trials

Informed consent is a cornerstone of ethical clinical research, ensuring participants understand the risks, benefits, and purpose of a study before voluntarily agreeing to participate. In the ASEAN region, informed consent requirements are influenced by each country’s regulations, cultural considerations, and language diversity. Understanding these differences is vital for sponsors, clinical investigators, and regulatory professionals working across multiple jurisdictions.

This article provides a tutorial-style breakdown of the major variations in informed consent documentation across ASEAN countries, with a focus on ethical standards, formatting, language translation, audiovisual requirements, and institutional review board (IRB) expectations. Special attention is given to vulnerable populations, including children and those with limited literacy.

Core Elements of Informed Consent:

According to ICH-GCP and CDSCO standards, the following components are typically required in any informed consent form (ICF):

• Purpose of the study
• Study procedures and duration
• Potential risks and benefits
• Voluntary participation and right to withdraw
• Confidentiality and data protection
• Compensation for injury
• Contact information for inquiries

Country-Specific Consent Documentation Requirements:

1. Singapore:

Governed by the Health Sciences Authority (HSA) and NHG Domain Specific Review Board, Singapore mandates consent forms be written in layperson language (grade 6–8 readability). English is primarily used, but translated versions in Mandarin, Malay, or Tamil are often required depending on the study population.

2. Malaysia:

Malaysia’s Medical Research and Ethics Committee (MREC) insists that ICFs be provided in both English and Bahasa Malaysia. The form must include sections for audio-visual consent documentation when applicable. Templates provided by the Ministry of Health are often used to maintain uniformity.

3. Thailand:

The Thai FDA and local IRBs require ICFs to be in Thai and validated for cultural appropriateness. Consent forms for illiterate participants must be read aloud and documented with thumbprint and witness signature. Assent forms for minors aged 7–17 are mandatory in pediatric trials.

4. Indonesia:

Regulated by Badan POM, Indonesia mandates ICFs in Bahasa Indonesia and requires approval from both the central ethics committee and institutional IRBs. Translations must be certified, and additional forms are required when guardians or legal representatives provide consent.

5. Philippines:

Guided by the Philippine Health Research Ethics Board (PHREB), consent documents must be in English and the local dialect (Tagalog, Cebuano, etc.). If participants cannot read, an impartial witness must sign the consent document. Audiovisual documentation is mandatory for clinical trials involving vulnerable subjects.

6. Vietnam:

The Ministry of Health requires ICFs in Vietnamese, and sponsors must ensure linguistic accuracy. IRBs often request both paper and digital versions of consent documents. Special provisions are made for subjects who are illiterate, elderly, or cognitively impaired.

Key Documentation Differences in ASEAN Trials:

1. Language Translation: Most ASEAN countries require the ICF in both English and the local language. Certified translations are preferred.
2. Witness Requirements: For non-literate populations, a neutral third-party witness is mandatory in Thailand, Indonesia, and the Philippines.
3. Audio-Visual Recording: Malaysia and the Philippines mandate AV recordings for vulnerable populations, especially in high-risk trials.
4. Assent Documentation: Assent forms for minors are explicitly required in Thailand and the Philippines, and encouraged elsewhere.
5. IRB Templates: Malaysia and Vietnam often require the use of IRB-provided ICF templates to standardize content and language.

Special Considerations for Vulnerable Populations:

ASEAN countries are particularly cautious about enrolling vulnerable subjects such as minors, pregnant women, or mentally impaired individuals. In such cases:

• Guardianship documentation is reviewed
• Assent is required from capable minors
• Ethics committees closely review consent content and delivery method

In countries like Vietnam, additional local consent forms may be required for specific disease studies (e.g., TB or HIV).

Common Mistakes and Solutions:

• Omitting Translations: Ensure all ICFs are bilingual with certified translations for target populations.
• Improper Formatting: Follow country-specific templates where available and review IRB SOPs.
• Lack of AV Recording: Confirm whether vulnerable groups require audio-video consent procedures and document accordingly.
• No Assent Process: Include assent procedures and forms for minors and cognitively aware adolescents.

Ethics Committee Review of Informed Consent:

Across ASEAN, ethics committees have the final say in approving the language, structure, and process of obtaining informed consent. Multiple review rounds may be required to address local norms, readability, and regulatory compliance.

For example, the Philippine IRB may insist that certain cultural expressions or superstitions be removed from translations to avoid participant confusion. In Thailand, trial sponsors are expected to submit a “Consent Process Flowchart” outlining how consent is obtained and documented.

Best Practices for Compliance and Quality:

• Use a Pharma SOP for informed consent tailored to each ASEAN country
• Maintain a library of IRB-approved ICF templates per language
• Ensure ongoing training for clinical site staff on GCP-compliant consent delivery
• Audit signed consent forms during monitoring visits
• Document AV consent sessions securely and in compliance with data protection laws

Regular updates based on Stability Studies and regulatory revisions help ensure informed consent materials reflect current science and ethical standards.

Conclusion:

While the ASEAN Clinical Trial Framework promotes harmonization, local regulatory nuances significantly impact how informed consent is documented. Awareness of these differences—and proactively designing consent procedures accordingly—is essential to maintain ethical standards and avoid regulatory delays. Sponsors should partner with local experts, ethics committees, and CROs familiar with regional consent expectations to streamline compliance and improve participant understanding across all ASEAN member states.