<Li> Blind : The subjects involved in the study do not know which study treatment they receive . If the study is double - blind , the researchers also do not know which treatment a subject receives . This intent is to prevent researchers from treating the two groups differently . A form of double - blind study called a `` double - dummy '' design allows additional insurance against bias . In this kind of study , all patients are given both placebo and active doses in alternating periods . </Li>
<Li> Blind : The subjects involved in the study do not know which study treatment they receive . If the study is double - blind , the researchers also do not know which treatment a subject receives . This intent is to prevent researchers from treating the two groups differently . A form of double - blind study called a `` double - dummy '' design allows additional insurance against bias . In this kind of study , all patients are given both placebo and active doses in alternating periods . </Li>
he purpose of making a clinical study double-blind is to
he purpose of making a clinical study double-blind is to
prevent researchers from treating the two groups differently
prevent researchers from treating the two groups differently