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Table 6 Identification of research subjects in the cluster-cluster, professional-cluster, and individual-cluster trial scenarios

From: Variability in research ethics review of cluster randomized trials: a scenario-based survey in three countries

  Frequency (%)
Cluster-cluster trial Yes No
All city residents in the intervention arm 50 (29.8)a 118 (70.2)
All city residents in the control arm 46 (27.9)a 119 (72.1)
Residents exposed to the advertisements 68 (39.5)a 104 (60.5)
Residents in intervention arm receiving screening 72 (42.1)a 99 (57.9)
Residents participating in the telephone survey 171 (90.0)a 19 (10.0)
Professional-cluster trial Yes No
Patient-level:   
All patients in the practices 37 (22.6) 127 (77.4)a
Patients presenting with back or knee pain 63 (38.4) 101 (61.6)a
Patients providing data for study outcome 1 64 (38.6) 102 (61.5)a
Patients providing data for study outcome 2 104 (62.3)a 63 (37.7)
Professional-level:   
All GPs in intervention practices 109 (66.9)a 54 (33.1)
All GPs in control practices 103 (63.6)a 59 (36.4)
GPs whose patients present with back or knee pain 127 (77.4)a 37 (22.6)
Individual-cluster trial Yes No
Residents receiving bed nets 158 (88.3)a 21 (11.7)
Residents in control arm receiving no bed nets 139 (79.9)a 35 (20.1)
Residents providing blood samples 177 (98.3)a 3 (1.7)
Village malaria workers 58 (36.7) 100 (63.3)a
  1. aIndicates that an answer is in agreement with the Ottawa Statement. GPs, general practitioners.