In 2004, the USPSTF found that available tests accurately identify people with HCV infection. The USPSTF found no studies that directly prove that screening for HCV infection in people with no known liver disease or symptoms leads to better outcomes for patients. However, some studies show that current treatments for HCV improve patient outcomes. Few studies looked at the harms of screening, but potential harms include anxiety as well as the adverse effects, inconvenience, and costs of treatment if HCV infection is found. People born between 1945 and 1965 are more likely to have HCV infection than people born during other years. This could be because they were exposed to blood transfusion before 1992 or have other unknown risk factors common in people born during those years.