![]() Improving quality of life for people living with a life-threatening disease or chronic health problem.Finding approaches to prevent a health problem, including in people who are healthy but at increased risk of developing a disease.Testing ways to diagnose a disease early, sometimes before there are symptoms.Often, a clinical trial is designed to learn if a new treatment is more effective or has less harmful side effects than existing treatments. These trials are the primary way that researchers determine if a new form of treatment or prevention, such as a new drug, diet, or medical device (for example, a pacemaker), is safe and effective in people. Observational studies do not test a medical intervention, such as a drug or device, but may help identify new treatments or prevention strategies to test in clinical trials.Ĭlinical trials are research studies that test a medical, surgical, or behavioral intervention in people. For example, researchers may ask a group of older adults about their exercise habits and provide monthly memory tests for a year to learn how physical activity is associated with cognitive health. Researchers gather information from people and compare changes over time. ![]() Observational studies monitor people in normal settings. Read and share this infographic (PDF, 317K) to learn why researchers do different kinds of clinical studies.
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