Hiep T Doan

University of California, San Francisco, San Francisco, California, United States

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Publications (8)15.12 Total impact

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    ABSTRACT: We conducted a controlled trial of a public education and provider intervention to increase colorectal cancer (CRC) screening rates among Vietnamese Americans, who typically have lower rates than non-Hispanic Whites. The public education intervention included a Vietnamese-language CRC screening media campaign, distribution of health educational material, and a hotline. The provider intervention consisted of continuing medical education seminars, newsletters, and DVDs. Vietnamese in Alameda and Santa Clara Counties, California, received the intervention from 2004 to 2006; Vietnamese in Harris County, Texas, were controls and received no intervention. A quasi-experimental study design with pre- and postintervention surveys of the same 533 participants was used to evaluate the combined intervention. The postintervention-to-preintervention odds ratio for having ever had a sigmoidoscopy or colonoscopy was 1.4 times greater in the intervention community than in the control community. Knowledge and attitudes mediated the effect of the intervention on CRC screening behavior. Media exposure mediated the effect of the intervention on knowledge. Improving CRC knowledge through the media contributed to the effectiveness of the intervention.
    American Journal of Public Health 03/2010; 100(5):870-6. · 3.93 Impact Factor
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    ABSTRACT: Colorectal cancer (CRC) screening rates are lower in Vietnamese Americans than in non-Hispanic Whites. Most Vietnamese Americans have ethnically concordant physicians and are willing to have CRC screening if their physicians recommend it. We conducted two continuing medical education (CME) seminars with participants recruited from the Vietnamese Physician Association of Northern California to increase their CRC screening knowledge. We used pre- and post-CME surveys to evaluate the CMEs and per-item McNemar's tests to assess changes in knowledge. Correct responses increased significantly from pre- to post-CME for all five items on CRC burden and four of 11 items on screening guidelines and practices at the first CME and for five of seven items on screening guidelines and practices at the second CME. Continuing medical education seminars were effective in increasing CRC screening knowledge among Vietnamese American physicians. This increase may lead to physicians' recommending and their patients' completing CRC screening tests.
    Journal of Health Care for the Poor and Underserved 01/2010; 21(2):568-81. · 1.10 Impact Factor
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    ABSTRACT: Rates of colorectal cancer screening in Vietnamese Americans are lower than those in non-Hispanic Whites. In this article, we describe rates of colorectal screening, identify determinants, and recommend educational strategies to improve screening. A cross-sectional sample of 867 Vietnamese aged 50 to 74 years drawn from a sampling frame of individuals in the Alameda and Santa Clara Counties, California, and Harris County, Texas, area telephone directories with Vietnamese surnames were interviewed in 2004. Colorectal screening recognition, receipt, currency, and intention rates were low. Although the screening rates are low, Vietnamese are receptive to screening if providers recommend it.
    Journal of Cancer Education 01/2008; 23(1):37-45. · 0.88 Impact Factor
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    ABSTRACT: Problem: Rates of colorectal screening among Vietnamese Americans are lower than non-Hispanic whites. Knowledge of factors associated with colorectal cancer screening is needed to target interventions appropriately. Methods: Using a listed sample of most common surnames, a random telephone survey was conducted among 867 Vietnamese American men and women from Alameda and Santa Clara Counties, California and Harris County, Texas. Multiple logistic regression models were developed to identify factors associated with colorectal cancer screening tests (fecal occult blood testing [FOBT], sigmoidoscopy or colonoscopy). Results: Factors positively associated with ever having received screening for colorectal cancer by any modality were: older age (65 to 74 years), residing in California, having private or public insurance, having a regular place of medical care, having a personal doctor, having heard of colon polyps, worrying about colon cancer, thinking might get colon cancer, thinking need FOBT and sigmoidoscopy/colonoscopy even if feeling healthy, and thinking sigmoidoscopy/colonoscopy preparation troublesome. Factors negatively associated included having annual household income less than $20,000, being employed, having a Vietnamese doctor, and thinking sigmoidoscopy/colonoscopy painful. Conclusions: Interventions need to target individuals in the 50-65 year age group; who have lower household income or do not have insurance, a regular place of care, or a personal doctor; who have a Vietnamese doctor; and who live in Harris County, Texas. These interventions need to increase knowledge of and attitudes toward colorectal cancer screening.
    135st APHA Annual Meeting and Exposition 2007; 11/2007
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    ABSTRACT: We sought to promote cervical cancer screening among Vietnamese American women in Santa Clara County, Calif. In 2001-2004, we recruited and randomized 1005 Vietnamese American women into 2 groups: lay health worker outreach plus media-based education (combined intervention) or media-based education only. Lay health workers met with the combined intervention group twice over 3 to 4 months to promote Papanicolaou (Pap) testing. We used questionnaires to measure changes in awareness, knowledge, and Pap testing. Testing increased among women in both the combined intervention (65.8% to 81.8%; P<.001) and media-only (70.1% to 75.5%; P<.001) groups, but significantly more in the combined intervention group (P=.001). Among women never previously screened, significantly more women in the combined intervention group (46.0%) than in the media-only group (27.1%) obtained tests (P<.001). Significantly more women in the combined intervention group obtained their first Pap test or obtained one after an interval of more than 1 year (became up-to-date; 45.7% to 67.3%, respectively; P<.001) than did those in the media-only group (50.9% to 55.7%, respectively; P=.035). Combined intervention motivated more Vietnamese American women to obtain their first Pap tests and to become up-to-date than did media education alone.
    American Journal of Public Health 09/2007; 97(9):1693-700. · 3.93 Impact Factor
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    ABSTRACT: Colorectal cancer is the third most common cancer in Vietnamese Americans. Their colorectal screening rates are lower than the rates of whites. Four focus groups were conducted to identify Vietnamese American sources and credibility of health information, media utilization, and intervention approaches. Vietnamese Americans trusted doctors and patient testimonials and had access to, and received most of their health information from, Vietnamese- language print and electronic media. Recommended intervention approaches include promoting doctors' recommendation of screening and using Vietnamese-language mass media, print materials, and oral presentations. Focus groups are useful in determining communication channels and intervention approaches.
    Journal of Cancer Education 02/2006; 21(2):80-3. · 0.88 Impact Factor
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    ABSTRACT: Vietnamese-American women who regularly see Vietnamese-American physicians are less likely to obtain Pap tests, perhaps because of the physicians' limited training in preventive medicine and the women's discomfort receiving Pap tests from male physicians. To address this problem, during 2001-2003, the University of California, San Francisco's (USCF) Vietnamese Community Health Promotion Project collaborated with the Vietnamese Physician Association of Northern California to organize 3 continuing medical education (CME) seminars on cervical cancer for association members. Experts gave lectures and answered questions about screening, diagnosis, and treatment to train physicians to identify risk factors, recommend Pap tests, and evaluate and conduct follow up of abnormal tests. To evaluate the seminars, we administered pre- and post-CME pencil-and-paper questionnaires. Data analysis employing the McNemar chi-squared test demonstrated significant changes in knowledge and understandingfrom pre- to post-CME in multiple areas. Results suggest that CME seminars can significantly increase Vietnamese physicians' knowledge about cervical cancer diagnosis and treatment.
    Ethnicity & disease 02/2004; 14(3 Suppl 1):S122-7. · 1.12 Impact Factor
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    ABSTRACT: Five times more Vietnamese-American women develop cervical cancer than white women. Few studies have examined whether community-based participatory research can effectively address Asian immigrants' health problems. This article reports the preliminary evaluation of 1 such project. A coalition of 11 organizations in Santa Clara County, California worked with university researchers to design and simultaneously implement a media education (ME) campaign and a lay health worker outreach (LHWO) program to increase Vietnamese-American women's cervical cancer awareness, knowledge, and screening. Two agencies each recruited 10 lay health workers (LHWs), who, in turn, each recruited 20 women who were then randomized into 2 groups: 10 to LHWO+ME (n = 200) and 10 to ME alone (n = 200). LHWs organized meetings with women to increase their knowledge and to motivate them to obtain Pap tests. Participants completed pre- and post-intervention questionnaires. At post-intervention, significantly more LHWO+ME women understood that human papillomavirus and smoking cause cervical cancer. The number of women who had obtained a Pap test increased significantly among women in both LHWO+ME and ME groups, but substantially more in the LHWO+ME group. Significantly more LHWO+ME women said they intended to have a Pap test. Media education campaigns can increase Vietnamese women's awareness of the importance of Pap tests, but lay health workers are more effective at encouraging women to actually obtain the tests. Lay health workers are effective because they use their cultural knowledge and social networks to create change. Researchers, community members, and community-based organizations can share expert knowledge and skills, and build one another's capacities.
    Journal of General Internal Medicine 08/2003; 18(7):516-24. · 3.28 Impact Factor

Publication Stats

177 Citations
15.12 Total Impact Points

Institutions

  • 2010
    • University of California, San Francisco
      • Division of General Internal Medicine
      San Francisco, California, United States
  • 2007–2010
    • Northern California Arthritis Center
      Walnut Creek, California, United States
  • 2006
    • Georgetown University
      Washington, Washington, D.C., United States