Which of the following is NOT a focus of epidemiologic research?

The focus of epidemiologic research is primarily on populations rather than individual cases. Epidemiology seeks to understand the distribution and determinants of health-related states or events in specified populations, as well as the application of this study to control health problems.

Studying individual health behaviors, while it may provide valuable insight, is generally not the primary aim of epidemiological studies. Instead, epidemiology is concerned with broader patterns and trends within groups of people to identify how certain risk factors may influence the health of entire populations.

Evaluating health interventions, examining health trends in populations, and assessing disease outbreaks are all key activities within epidemiology. These processes involve looking at larger-scale data to inform public health decisions and policies, highlighting the discipline's commitment to understanding health at a community and population level.