Quasi-Experimental Design in HIV/AIDS Epidemiology

Introduction: Experimental Research in Analytic Epidemiology

In 2011, the United States Food and Drug Administration reported a shortage of vital chemotherapy drugs, which interfered with clinical trials and contributed to probable challenges in evaluating data from those studies. According to the National Institutes of Health, considerable research trials were hindered by shortages of drugs for the treatment of infectious diseases and cancer (Allen, 2011). One of the most important aspects of advancing disease prevention and treatment is experimental research that incorporates clinical trials. After the establishment of a risk factor, an intervention is usually tested through experimental research methods and designs. In such cases, the most important question is whether the drug effectively prevents or ameliorates symptoms. Experimental research plays a crucial role in analytic epidemiology — to such an extent that it is widely considered the "gold standard" of the process.

Epidemiological Context of HIV/AIDS

Epidemiological study of HIV/AIDS has traditionally focused on individual risk factors, which have proven inadequate to address the current public health challenges posed by this population health problem (Scribner et al., n.d.). This inadequacy stems from the fact that HIV/AIDS involves complex interactions between biological and social factors. As a result, the current healthcare system and practitioners have focused on developing a new epidemiological approach over the past few decades. These efforts have contributed to the emergence of ecological epidemiology as a framework for addressing these complexities.

Randomized Controlled Trials as the Gold Standard

The epidemiological context of HIV/AIDS depends on various factors, including the intervention of interest, the intervention's impact, and the existing state and trends in biological and behavioral factors affecting transmission dynamics. Randomized controlled trials are regarded as the most effective means of assessing specific interventions and serve as the "gold standard" for managing the influence of context (Grassly et al., 2001, p. 1122). Their effectiveness is informed by the ability of randomization — across individuals or communities — to eliminate the effect of variation in contextual factors on the apparent success or failure of an intervention. In recent years, randomized controlled trials have identified a significant number of interventions with potential for broader implementation. The most common interventions identified by these trials include enhanced quality and use of STI services, use of safe breastfeeding alternatives, and sexual behavior change programs.

Quasi-Experimental Research Design for HIV/AIDS

One example of a research approach used in HIV/AIDS studies is the quasi-experimental research design. A quasi-experimental research design is not only community-based but also culturally and ecologically grounded as an HIV prevention intervention. This method is built on the new epidemiological approach of ecological epidemiology. In an experiment evaluating an HIV prevention intervention for Mexican-American female adolescents — known as the SHERO's program — a quasi-experimental research design demonstrated considerable increases in behavioral outcomes among intervention participants (Harper et al., 2009, p. 110). The design produced these results when used to examine the ability of a one-time clinical-based intervention to reduce HIV/AIDS risk in the study population.

Quasi-experimental research design appears to be particularly well-suited to HIV/AIDS research because it addresses the wide range of culture-specific ecological and psychosocial factors that may affect HIV risk and protection. Rather than focusing primarily on individual risk factors, this design incorporates a multi-level framework that examines contextual factors affecting risk at the individual level. It rests on the assumption that social and environmental constructs can either promote or restrict individual-level behaviors, which in turn contribute to associated risk. As a result, quasi-experimental research design helps address current public health challenges related to HIV/AIDS and the complexities of interactions between biological and social factors.

Conclusion

Experimental research is an important component of epidemiological study — one that encompasses clinical trials and plays a critical role in the prevention and treatment of disease. The research design that best addresses HIV/AIDS is the quasi-experimental research design, which centers on ecological factors. The effectiveness of this design stems from its emphasis on ecological and cultural factors that influence risk at the individual level. By accounting for the complex interplay of social, environmental, and biological determinants, quasi-experimental methods offer a meaningful path forward in HIV/AIDS prevention research.

References

Allen, J. (2011, September 23). U.S. drug shortage could threaten U.S. health system. ABC News. Retrieved September 23, 2013, from http://abcnews.go.com/Health/CancerPreventionAndTreatment/drug-shortages/story?id=14593880

Campbell, D. T., & Krauss, B. J. (2012). Speculations on quasi-experimental design in HIV/AIDS prevention research. Journal of Methods and Measurement in the Social Sciences, 3(1), 52–85.

Grassly, N. C., et al. (2001). The effectiveness of HIV prevention and the epidemiological context. Bulletin of the World Health Organization, 79(12), 1121–1132.

Harper, G. W., et al. (2009). A quasi-experimental evaluation of a community-based HIV prevention intervention for Mexican-American female adolescents: The SHERO's program. AIDS Education and Prevention, 21, 109–123.

Scribner, R., et al. (n.d.). HIV risk and the alcohol environment. Retrieved from the National Institute on Alcohol Abuse and Alcoholism website: http://pubs.niaaa.nih.gov/publications/arh333/179-183.htm