The age-adjusted death rate from<unk>  per 100,000 inhabitants in 2004. Age adjusted, new cases of<unk>  in 2017 The<unk>  is the study of the factors affecting<unk> , as a way to infer possible trends and causes. The study of<unk>  epidemiology uses epidemiological methods to find the cause of<unk>  and to identify and develop improved treatments. This area of study must contend with problems of lead time bias and length time bias. Lead time bias is the concept that early diagnosis may artificially inflate the survival statistics of a<unk> , without really improving the natural history of the disease. Length bias is the concept that slower growing, more indolent tumors are more likely to be diagnosed by screening tests, but improvements in diagnosing more cases of indolent<unk>  may not translate into better patient outcomes after the implementation of screening programs. A related<unk> n is overdiagnosis, the tendency of screening tests to diagnose diseases that may not actually impact the patient's longevity. This problem especially applies to prostate<unk>  and PSA screening. Some<unk>  researchers have argued that negative<unk>  clinical trials lack sufficient statistical power to discover a benefit to treatment. This may be due to fewer patients enrolled in the study than originally planned.
Epidemiology of cancer
Epidemiology of diabetes
Epidemiology of breast cancer
Epidemiology of metabolic syndrome
Epidemiology of HIV/AIDS
Epidemiology of domestic violence
Psychiatric epidemiology
Comparison of birth control methods