Figure 1.
Study selection.
Table 1.
Systematic review of ethics committee approval and participant information and consent in reports of cluster randomized trials – characteristics of trials.
Table 2.
Systematic review of ethics committee approval and participant information and consent in reports of cluster randomized trials – reporting of ethics committee approval and participant information and consent.
Table 3.
Systematic review of ethics committee approval and participant information and consent in reports of cluster randomized trials – author survey of handling participant information and consent.
Table 4.
Systematic review of ethics committee approval and participant information and consent in reports of cluster randomized trials – author survey of cluster guardians.
Figure 2.
Risk of selection bias.
Table 5.
Systematic review of ethics committee approval and participant information and consent in reports of cluster randomized trials – discrepancies between author answers and reporting.
Table 6.
Authors' perception of management of participant informed consent in cluster randomized trials.