UBACC Scores Rose Markedly With Repeated Consent in African Genetics Research
A continent-wide genetics study in mental health research has put a hard number on something investigators often suspect at the bedside: one round of consent is not always enough. In a cross-sectional cohort spanning Ethiopia, Kenya, South Africa, and Uganda, repeated administration of the University of California, San Diego Brief Assessment of Capacity to Consent questionnaire produced a steep improvement in comprehension scores across attempts, suggesting that a structured, interactive consent process can materially strengthen decisional understanding in large research programs.
The study was built around a central ethical problem in psychiatric genetics. As genetic research expands across Africa, investigators need a way to judge whether participants truly understand the study context, the risks and benefits of participation, and the voluntary nature of enrollment. Informed consent cannot rest on a signature alone when the research question involves mental illness, variable insight, and complex biological concepts that may be unfamiliar even to highly literate participants. UBACC was used here as a practical test of whether understanding could be improved in real time, not merely documented after the fact.
Repetition, Not Just Disclosure, Drove Comprehension Gains
The cohort was large by any standard: 42,953 adults enrolled between 2018 and 2022, with 57.35% male and a mean age of 36.69 years. Half of the participants had psychosis and half served as controls. Research assistants read the participant information sheets and consent materials aloud, then asked participants questions about the study. If the score fell short of the maximum of 20, the process was repeated up to three more times.
The score trajectory was striking. The mean UBACC score moved from 13.27 at the first attempt to 16.83 at the second, 18.10 at the third, and 18.37 at the fourth. Each attempt produced a statistically significant increase over the one before it. In practical terms, the biggest jump came after the first re-explanation, a reminder that comprehension in consent discussions can improve quickly when information is revisited in plain language rather than delivered once and assumed absorbed.
One read-through was not enough for many participants.
That pattern carries obvious implications for psychiatric genetics, where consent often involves abstract concepts such as DNA storage, data sharing, and future use of specimens. These ideas are easy to underestimate in their complexity. Even when participants are willing to join a study, willingness and understanding are not identical, and the UBACC format appears to make that distinction operational by testing recall, reasoning, and voluntariness instead of assuming them.
Psychosis and Age Were Linked to Lower Odds of a Perfect Score
Regression analyses identified several factors associated with achieving the maximum UBACC score of 20. Male sex was associated with higher odds of a perfect score, with an odds ratio of 1.35 and a 95% confidence interval from 1.28 to 1.40. Being a case, rather than a control, was associated with lower odds of reaching a perfect score, with an odds ratio of 0.59 and a 95% confidence interval from 0.56 to 0.61. Lower age was also associated with modestly lower odds of scoring 20, with an odds ratio of 0.99; the abstract truncates the remainder of the confidence interval.
The psychosis finding is not surprising in a study of consent capacity, but it is still clinically important. Symptoms that affect attention, working memory, processing speed, and the ability to weigh choices can complicate informed consent even when participants are otherwise cooperative and motivated. The result does not imply that people with psychosis cannot consent. It does suggest that consent procedures in psychiatric research should be designed to detect and address uncertainty early, before enrollment is treated as a settled event.
Ethical Value in a Multisite African Genetics Program
The scale and setting matter. This was not a small, single-site experiment with a handpicked volunteer sample. It was a multicountry effort across East, Central, and Southern Africa, embedded in mental health facilities and general outpatient clinics. That breadth matters because consent processes that work in one institution or one cultural setting can fail elsewhere if they depend too heavily on educational background, prior exposure to research, or familiarity with biomedical terminology.
UBACC is attractive because it is brief, structured, and adaptable to settings where time and staff are limited. The data here suggest it can function as more than a screening tool. Used iteratively, it becomes part of the consent conversation itself, allowing research staff to identify gaps in understanding and correct them before proceeding. In genetic research, where the downstream uses of samples and data may extend beyond the immediate study, that kind of iterative consent is more than administrative polish. It is a safeguard against enrollment based on misunderstanding.
The findings also speak to a common tension in research ethics: investigators often aim to recruit efficiently, while participants need time to process unfamiliar information. A tool that pushes the process toward repeated explanation rather than one-way disclosure may improve both ethics and data quality. Participants who truly understand what is being asked of them are less likely to enter a study under false assumptions, and that protects the integrity of the research as much as the participant.
Consent Capacity Should Be Treated as a Process, Not a Checkbox
The clearest bedside lesson is that capacity is not fixed at the first question. Participants improved after repetition, and the gains were large enough to move the mean score close to the top of the scale. For ethics committees, investigators, and research staff, that means consent procedures should be written with room for correction, clarification, and reassessment, especially in psychiatric genetics studies that enroll people with psychosis.
This study also leaves a practical question hanging over future work: how should a brief capacity tool like UBACC be adapted across languages, settings, and levels of schooling without diluting the rigor of the original instrument? The abstract shows the tool performed well in a large African cohort, but it does not resolve how best to standardize training, preserve consistency across sites, or determine when repeated explanation should give way to formal reassessment by a clinician. Those operational questions will matter as genetics research continues to expand across the continent, and as investigators try to balance speed, access, and genuine informed consent.