This single-school mixed-methods study examined records for 1,021 Thai medical students admitted in 2017–2022 through the portfolio-based TCAS1 or examination-based TCAS3 route. Documented extracurricular research participation was 21.1% versus 6.6%, with an adjusted odds ratio of 9.19 for TCAS1. Thirty interviews highlighted prior exposure, confidence, mentoring, visible entry routes, workload, and unclear opportunities. The authors explicitly caution that the association is not causal and that admission route is not a proxy for student potential.
Key findings
- Documented eligible participation occurred in 103 of 1,021 students (10.1%): 52 of 246 TCAS1 students (21.1%) and 51 of 775 TCAS3 students (6.6%).
- The primary model estimated an adjusted odds ratio of 9.19 (95% CI 4.96–17.03) for TCAS1 versus TCAS3. This is an adjusted association still vulnerable to selection and unmeasured confounding.
- Among 854 students with pre-university GPA, the pathway OR was 11.25 before and 10.63 after adding GPA; the GPA estimate was imprecise and nonsignificant, which does not prove GPA has no role.
- Interviews highlighted prior exposure and self-efficacy, mentoring and visible entry routes, workload, academic pressure, and unclear pathways. Contrasting cases showed that prior exposure was neither necessary nor sufficient for participation.
- The outcome was documented activity, not research quality, long-term capability, or academic achievement, and does not support using TCAS1 as a proxy for potential.
Why this matters globally
Many countries use multiple admissions routes while seeking to develop physician-scientists. These findings suggest that post-admission differences may reflect starting capital and visibility of opportunities rather than fixed student traits. The transferable lesson is to make research routes, mentoring, and application processes accessible across groups—not to export one institution's odds ratio into selection policy elsewhere.
Thai researcher contribution
All five authors hold Thai affiliations through the Faculty of Medicine Ramathibodi Hospital, Mahidol University, or its Chakri Naruebodindra Medical Institute. Tanatuch Tiratrakoonseree also lists Washington University, and Titiwat Sungkaworn is corresponding author. Ramathibodi supported the project, which is grounded in Thailand's TCAS admissions context.
Limitations to consider
This observational, single-institution study remains vulnerable to selection bias and unmeasured confounding despite adjustment. Records may miss unreported activity and capture only whether one eligible event occurred, not its quality or the student's role. Follow-up differs by entry cohort, GPA was available for 854 of 1,021 students, and quantitative and qualitative record windows ended in different years. Thirty interviews contextualise mechanisms but do not provide population estimates. The publisher labels the article an Early Version subject to editing before the Version of Record.