The Effect of a Targeted Video Intervention on Beliefs Regarding Hypertension

1. Design Randomized, single-blinded controlled trial.
2. Participants/Setting Permission from our Institutional Review Board has already been granted for this project (IRB #PRO07020003), but we are in the process of reapplying based on our revisions in response to the JGAP's initial review (please see section Q below). Participants will be recruited from the patient population of our largest residency family health center. The family health center cares for a pool of approximately 5000 patients with low to moderate income. Its population is roughly 40% male and 60% female. The population is racially diverse (Caucasian=60%; African American=20%; Other=20%). In order to recruit our study sample, we will generate a random list of patients from this health center's electronic records. All selected individuals will be contacted to assess whether they meet study criteria. As listed in Appendix 2, only persons with a history of hypertension or risk factors for hypertension will be included. In this way, we will recruit 80 volunteers aged 18-65.
3. Procedure Selected individuals will participate in two sessions. The first will consist of the intervention with pre-testing and immediate post-intervention testing, and the second will consist of a follow-up survey two months after the intervention. We will offer a $15 incentive (local grocery store gift card) to participate at each of these two steps for a total incentive of $30. Study personnel will contact those patients identified in the random sample by telephone and will read them a complete recruitment form. Recruited subjects will make an appointment to meet the research assistant for the initial survey testing and intervention exposure. At this appointment, study personnel will obtain verbal assent. Participants will be randomized using block randomization, stratifying for gender and age, into control and treatment arms. The entire randomization scheme will be completed a priori. Subjects will not be informed of their status as either a control or intervention group participant (single-blinded). All subjects will be led to a private room and will be given 15 minutes to complete the pre-test (Appendix 3). Participants in the intervention group will watch a twenty-five minute episode of "White Coats." Participants in the control group will watch a twenty-five minute educational video about depression. Immediately following the interventions, all subjects will be administered post-tests (Appendix 4). The research assistant will contact participants two months later by telephone to schedule a time to return to the family health center to take the delayed post-test (Appendix 5).
4. Intervention The intervention will consist of a twenty-five minute episode of a local health education situation comedy television series. Two physicians affiliated with a Family Medicine Residency and Fellowship Program created and currently produce this television series, entitled "White Coats," which currently airs on a local cable public access channel. The series features a fictional married couple of Family Medicine physicians who work in the same practice, located in our community. In both their professional and private lives and, in moments both humorous and serious, these doctors teach patients about a wide variety of health topics. The intervention episode addressing hypertension will focus on three different patient-physician plot lines, which were developed to specifically address each of the beliefs about hypertension highlighted in the theoretical model (susceptibility, seriousness, etc.).
5. Measures Evaluation will consist of pre- and post-testing, both immediate and at a two-month follow-up, with a self-administered written survey. The primary outcome measures will consist of five items (Q15-Q19) representing constructs from the health belief model and social cognitive theory: (1) perceived seriousness of hypertension (Q15), (2) perceived susceptibility to hypertension (Q16), (3) barriers to hypertension control (Q17), (4) self-efficacy regarding hypertension control (Q18), and (5) outcome efficacy regarding hypertension control (Q19). All outcomes will be scored on a 1 to 7 point Likert scale. We have modeled question items from existing reliable, valid instruments,23-25 although no complete previously validated instrument exists to specifically measure these five constructs as they relate to hypertensive control.

We will collect demographics including age as a continuous variable (based on date of birth), gender, race/ethnicity, and socioeconomic status. Race/ethnicity will be collected in the manner suggested by the National Institutes of Health, allowing participants to select more than one race/ethnicity. Socioeconomic status will be approximated with highest level of education achieved.