Greg Guest, PhD

Research Director

Areas of expertise

  • Research and evaluation methodology
  • International project management
  • Research ethics
  • Monitoring and evaluation

Projects & Resources

Published Research

  • Evaluating bang for the buck: A cost-effectiveness comparison between individual interviews and focus groups based on thematic saturation levels
    Namey E, Guest G, McKenna K, Chen M
    Am J Eval 2016 Sep; 37(3): 425-40. [Journal Impact Factor: 0.808]

    Individual interviews and focus group discussions form the foundation of most qualitative research and evaluation activities. The authors provide an empirical comparison of cost and time required to reach data saturation using the two methods, based on actual expenditures from parallel interview and focus group datasets generated through random allocation of participants. Interviews were more cost-effective in most contexts.

  • On the road again: Concurrency and condom use among Uganda truck drivers
    Costenbader EC, Lancaster K, Bufumbo L, Akol A, Guest G.
    Afr J AIDS Res 2015 Jun; 14 (2): 117-25. [Journal Impact Factor: 0.790]

    Analyses of data collected from Ugandan truck drivers showed that overlapping sexual relationships with two or more long-term partners, with whom condoms were not being used, was common. These findings are of particular concern because this population is sometimes considered a key bridging population in the HIV epidemic. Innovative intervention programs that address the realities of truck drivers' lifestyles are needed for these men and their partners.

  • Motivations for reducing other HIV risk-reduction practices if taking pre-exposure prophylaxis: Findings from a qualitative study among women in Kenya and South Africa
    Corneli A, Namey E, Ahmed K, Agot K, Skhosana J, Odhiambo J, Guest G.
    AIDS Patient Care STDS 2015 Sep; 29 (9): 503-9. [Journal Impact Factor: 3.497]

    Women at high risk for HIV in Kenya and South Africa described numerous reasons for reducing or stopping the use of condoms if they were to start taking pre-exposure prophylaxis (PrEP) for HIV prevention. These findings suggest that enhanced counseling is needed to promote informed decision making and to ensure overall sexual health for women using PrEP, particularly with respect to the prevention of pregnancy and other sexually transmitted infections when PrEP is used alone.

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