Blinding in Clinical Trials

4. Types of Blinding



Unblinded or open label 

All are aware of the treatment(s) 

Single blind or single-masked 

The participants are blinded but no one else is 

Double blind or double-masked 

The participants and clinicians / data collectors are blinded 

Triple blind 

The participants, clinicians / data collectors and outcome adjudicators / data analysts are blinded