Figure 3.

Quality assessment for risk of bias in each randomised controlled trial, including associated reanalysis. Publications were assessed against seven quality criteria, as shown in (B). (A) The number of quality requirements reached, expressed as the percentage of studies with each score out of 7. (B) Breakdown of the risk of bias, defined as high or low, across each of the seven quality criteria for all the RCTs (and reanalyses). The results presented relate to all references cited in Table 1.