Blinding in Clinical Trials

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4. Types of Blinding

Type

Description

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