Skip to main content

Advertisement

Table 1 Trialistsinterpretations of the terms ‘single-blind’ and ‘double-blind’ a

From: Information on blinding in registered records of clinical trials

Who was mentioned as blinded Trial was labelled as
  Single-blind Double-blind
Patient, caregiver, data analyst / investigator, outcomes assessor 0 79
Patient, caregiver, data analyst / investigator 0 19
Patient, caregiver, outcomes assessor 0 2
Patient, data analyst / investigator, outcomes assessor 0 9
Caregiver, data analyst / investigator, outcomes assessor 0 1
Data analyst / investigator, outcomes assessor 0 1
Patient, outcomes assessor 0 12
Patient, data analyst / investigator 1 68
Patient, caregiver 0 3
Outcomes assessor 22 0
Data analyst / investigator 16 0
Caregiver 1 0
Patient 26 0
Total 66 194
  1. aRecords that contained both blinding labels and information on who was blinded mainly originated from two registries. One registry asked for information on the blinding status of subjects, clinicians or therapists, outcome assessors and/or data analysts. The other registry asked for information on the blinding status of subjects, caregivers, outcome assessors and/or investigators. Because of the similarity between these two classifications, for this table, trials that were labeled to the fourth category of ‘data analysts’ on one registry and ‘investigators’ on the other were categorized as the same group.