Impact of Youth Community Health Volunteers on Community Health Screening Program Outcomes for Older Adults: Mixed Methods Evaluation Study.

Background: Community health screening programs frequently report inconsistent follow-up rates and barriers to sustained lifestyle changes. HealthStart is a Self-Determination Theory (SDT)-based intervention that aims to increase the autonomy and competence of participants via volunteer engagement, health and digital coaching, and posthealth screening follow-up. Youth community health volunteers (YCHVs) were taught principles of motivational interviewing, health coaching, and the social determinants of health through a program model anchored in principles of intergenerational and service learning. YCHVs, guided by health care volunteers, served as health and digital advocates for participants over a 3-month postscreening period. Objective: This study aims to evaluate the effectiveness and acceptability of the HealthStart program, a structured, layperson-led intergenerational health coaching intervention. Methods: This study used a convergent parallel mixed methods design. A total of 192 older adult participants' (mean age 66.9, SD 9.6 years) quantitative data were collected through pre- and postprogram surveys between September 2022 and January 2024. Follow-up with primary care provider (PCP) was the primary outcome; secondary outcomes include health goal attainment, self-efficacy, and digital and health literacy among older adults, and acceptability among all stakeholders. PCP follow-up and health goal attainment were self-reported, while self-efficacy was measured using the Patient Activation Measure-13. Health and digital literacy were assessed with an adapted questionnaire and the eHealth Literacy Scale (eHEALS), respectively. A total of 36 semistructured interviews were conducted with 13 older adults, 17 YCHVs, and 6 health care volunteers in the qualitative study between November 2023 and January 2024, which were qualitatively analyzed using thematic analysis. A joint analysis was conducted to generate meta-inferences. Results: The follow-up rate among PCPs increased significantly from 42.7% to 84.5% (P<.001). A total of 66.2% (92/139) of the participants achieved their health goals, and 81.3% (113/139) reported satisfaction with the program. There were no significant pre-post differences in Patient Activation Measure-13, knowledge, and eHEALS scores. However, a statistically significant correlation was found between postcycle eHEALS scores and the number of follow-up visits (P=.003). The qualitative findings substantiate HealthStart's Theory of Change and its SDT underpinnings. Participants' narratives highlighted the 3 SDT psychological needs, increased autonomy, competence, and relatedness, which are associated with sustained behavior change and health engagement. An increase in the PCP follow-up rate was influenced by individually tailored goal setting and relationship-building that leveraged motivational interviewing to support intrinsic motivation. The program's primary outcome was, to some extent, influenced by digital health onboarding and possibly improvements in health literacy. Participants' self-efficacy could have been enhanced with a structured social prescription framework. Conclusions: HealthStart demonstrated the feasibility of using YCHVs and SDT principles to improve PCP follow-up rates and promote healthier lifestyles through digital enablement among older adults participating in community health screening.