Study was conducted to see for role of radiation in leukemia, 100 patients selected among which 70 given history of exposure, among 100 controls 30 giving history of exposure. What is the bias in the study ?

Social & Preventive Medicine

Study was conducted to see for role of radiation in leukemia, 100 patients selected among which 70 given history of exposure, among 100 controls 30 giving history of exposure. What is the bias in the study ?

A study is to be conducted with regards to the fat content…

'There has been a gradual increase in number of non-communicable disease cases…

All of the following are done to remove Confounding except