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

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