Adolescent Consent Procedures Shape Research Engagement

A pre-registered mixed-methods randomised controlled trial published in BMC Medical Research Methodology has examined how different consent procedures affect adolescent participation in health research. The study, led by Emma Soneson and colleagues, investigated the impact of consent mechanisms on participation rates, survey completion, and data integrity. The research team sought to determine whether varying levels of autonomy in the consent process influence how young people engage with sensitive health topics. The findings suggest that while enhanced autonomy may reduce completion rates, it supports a more ethically robust form of participation that does not compromise the quality of the data provided by those who remain.

The quantitative strand of the investigation was a parallel-group randomised controlled trial involving 3,720 adolescents. Participants were assigned to one of five different consent procedures before completing an online survey focused on health, wellbeing, and risk behaviours. The study measured initial consent rates, withdrawal rates, and completion rates at both the survey and item levels. Additionally, the researchers assessed responses on measures of varying sensitivity to determine if the consent procedure influenced the content of the answers. This design allowed for a direct comparison of how procedural differences in consent affected participant behaviour and data output.

Complementing the trial, the qualitative strand consisted of a focus group study involving 46 adolescents. This component was conducted in line with Constructivist Grounded Theory methodology to explore adolescents’ views on research consent. The qualitative findings indicated that adolescents valued choice and control in research, feeling that such autonomy could increase their comfort and openness, particularly when discussing sensitive topics. Participants suggested that consent procedures could influence their initial decisions to participate, the specific information they choose to share, and their longer-term retention in research studies. These insights highlighted the perceived importance of agency in the research experience from the participants’ perspective.

The quantitative results revealed that initial consent rates did not significantly differ across the five arms of the trial, ranging from 92.7% to 95.4%. However, in procedures that included repeated consent prompts, approximately 6% to 8% of participants withdrew their consent at least once during the study. Survey completion rates varied by procedure, with the anonymous procedure yielding the highest survey-level completion rate at 83.3%. The mean item-level completion for this group was 49.7 out of 54 items. Despite these variations in engagement and completion, the researchers found no significant differences in how participants responded to the questionnaire items in terms of scores across the different consent groups.

The study highlights a tension between scientific priorities and participant autonomy. Enhanced autonomy was associated with reduced completion rates, which might appear detrimental if judged solely by the volume of data collected. However, the authors argue that this reduction represents a more ethically robust form of participation. The fact that differences in withdrawal did not appear to alter how the remaining students responded to the questionnaire items suggests that allowing greater control over participation may support more authentic engagement and disclosure. This implies that the data collected from participants who retain their consent under high-autonomy procedures may be of comparable or superior quality in terms of authenticity.

The researchers noted that the qualitative insights regarding the value of choice and control were not fully reflected in the quantitative findings. While adolescents expressed a strong preference for autonomy, the actual behavioural outcomes in the trial showed complex patterns of engagement. The lack of significant differences in response scores across arms indicates that the consent procedure did not systematically bias the data in terms of sensitivity or content. This finding is crucial for researchers aiming to balance ethical imperatives with the need for reliable data in adolescent health studies. It suggests that the mode of consent does not necessarily distort the substantive findings of the research, even if it affects the number of completed surveys.

The implications of this trial extend to the design of future adolescent health research. The findings suggest that consent procedures should be tailored to the specific aims and context of the study. Researchers must balance the scientific need for high completion rates with the ethical obligation to respect adolescents’ rights to autonomy. The study provides empirical evidence that consent procedures differentially influence engagement, but it does not dictate a single best practice. Instead, it offers a framework for considering the trade-offs between participation rates, data integrity, and ethical robustness when designing studies involving young people.

Limitations of the study include the specific context of the online survey and the particular population of adolescents involved. The results may not be generalisable to all types of health research or all adolescent populations. Nevertheless, the trial provides valuable empirical evidence for the research community, demonstrating that the mechanics of consent are not merely administrative but have measurable impacts on how adolescents interact with health research.

Subject of Research: Impact of consent procedures on adolescent health research participation and data integrity

Article Title: A mixed-methods randomised controlled trial of consent procedures in adolescent health research: implications for participation, completion, and data integrity

Article References: Soneson, E., Bear, H., Karimipour, M., Robertson, O., & Fazel, M. (2026). A mixed-methods randomised controlled trial of consent procedures in adolescent health research: implications for participation, completion, and data integrity. BMC Medical Research Methodology. https://doi.org/10.1186/s12874-026-03006-9

Image Credits: AI Generated

DOI: 10.1186/s12874-026-03006-9

Keywords: adolescent health, informed consent, randomised controlled trial, research ethics, participation rates, data integrity, mixed-methods, survey completion, participant autonomy, BMC Medical Research Methodology, randomised, controlled