The extent to which a specific health care treatment, service, procedure, program or other intervention does what it is intended to do when used in a community dwelling population is termed its :-

Social & Preventive Medicine

The extent to which a specific health care treatment, service, procedure, program or other intervention does what it is intended to do when used in a community dwelling population is termed its :-

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