Culturally Tailored Mindfulness-Positive Psychological Intervention Using Virtual Reality

The primary outcome is the racism-related stress measured by vicarious racism. Vicarious racism involves seven items that measure the frequency of hearing about or seeing other people of the same racial group experiencing racism: 1) in public or 2) in the news, 3) from romantic partners or, 4) friends and family members, 5) heard by politicians and 6) other public figures, and 7) seeing racist posts on social media during the Coronavirus Disease 2019 pandemic: 0 (never) - 5 (every day). Regarding racism-related stress, participants answer three questions: 1) the degree to which participants thought about these experiences (0 [never] - 4 [always]) and 2) how distressed, and 3) concerned they were about these experiences (0 [not at all] - 4 [extremely]; Cronbach's alpha = 0.89).

Perceived stress is measured by the Perceived Stress Scale 4, which asks a 4-items about how often the participants felt or thought a certain way during the last month, given a five-point scale: 0 (never) - 4 (very often). Previous studies have indicated that internal consistency reliability of the Korean version was 0.82 (Cronbach's alpha).

Optimism is assessed using the Life Orientation Test-Revised, where respondents report their own feelings to measure individual differences in generalized optimism and pessimism. The Life Orientation Test-Revised consists of 3 optimism items, 3 pessimism items (reverse code), and 3 filler items (exclusion from the total scores. Given each item is presented on a 5-point scale (0 = I disagree a lot; 4 = I agree a lot), the total score ranges from 0 (least optimistic) to 24 (most optimistic; Cronbach's alpha = 0.72 - 0.78). Internal consistency reliability of the Korean version of the Life Orientation Test-Revised was 0.81 (Cronbach's alpha).

Positive affect will be derived using the four positively worded items of the Center for Epidemiological Studies Depression Scale as follows: 1) I felt that I was just as good as other people, 2) I felt hopeful about the future, 3) I was happy, and 4) I enjoyed life. The sum of the four items ranges from 0 to 12. Reliability measured by internal consistency for the Korean version of the Center for Epidemiological Studies Depression Scale was 0.89 (Cronbach's alpha) in a previous publication.

The Life Engagement Test is a 5-point Likert scale measuring participants' life engagement. The Life Engagement Test consists of six items as a continuous variable, but three items are reverse-coded so that higher scores indicate better life engagement. Possible responses for all questions are from 1 (strongly disagree) to 5 (strongly agree). There is no previous study that tested the reliability of older Korean adults. However, another study indicates a Cronbach's alpha of 0.84.

The Mindful Attention Awareness Scale consists of 15 questions to measure dispositional mindfulness characteristics. The sample questions are: The Mindful Attention Awareness Scale is a continuous variable with response options ranging from 1 (almost always) to 6 (almost never). Previous studies used the Mindful Attention Awareness Scale for Koreans, and its internal consistency reliability ranges from 0.87 to 0.95 (Cronbach's alpha).

The Everyday Discrimination Scale measures the magnitude of unfair treatment in ongoing and routine experiences in daily life. The Everyday Discrimination Scale involves a nine-item scale with a six-point Likert scale: 0 (never) - 5 (almost every day). Its internal consistency reliability (Cronbach's alpha) according to previous studies targeting various ethnicities (e.g., White, Black, Hispanic/Latino, and Asian) was 0.88 (Cronbach's alpha).

The Simulator Sickness Questionnaire was developed to measure cybersickness symptoms in virtual reality research. The Simulator Sickness Questionnaire measures three domains (e.g., nausea, oculomotor, and disorientation) assessed through weighting 16 symptoms of cyber sickness. The measure is scored using a 4-point scale and weighted according to each factor to calculate the total score. Internal consistency reliability of the Simulator Sickness Questionnaire (Cronbach's alpha) was 0.94.

Participants answer the scales involving perceived ease of use, perceived usefulness, and attitude toward using virtual reality, with a 5-point Likert scale (1: strongly disagree; 5: strongly agree).

The Patient-Reported Outcomes Measurement Information System Bank v1.0 - Anxiety consists of 4 questions to measure anxiety levels. This measurement ranges from 1 (never) to 5 (always).

The Patient-Reported Outcomes Measurement Information System Bank v1.0 - Depression consists of 4 questions to measure depressive symptom levels. This measurement ranges from 1 (never) to 5 (always).

Demographic variables include age, sex, income level, years living in the U.S., education years, employment status, marital status, and health insurance.

Feasibility consists of recruitment rates (potential participants who were approached for recruitment), enrollment rates (≥20% of participants who decide to enroll), retention/attrition rates (goal: 70% of participants who completed the post-intervention assessment, answering Yes/No), and (non)compliance or adherence rates.