Table 6 Risk of bias assessment for the three impact studies
Randomsequencegeneration | Allocationconcealment | Baselineoutcomemeasurementssimilar | Baselinecharacteristicssimilar | Incompleteoutcomedata | Knowledge ofthe allocatedinterventionsadequatelypreventedduring the study | Protectionagainstcontamination | Selectiveoutcomereporting | Other risksof bias | |
|---|---|---|---|---|---|---|---|---|---|
Randomised controlled trials | |||||||||
Emery 2017 [56] | ✓ | x | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
Pre-post study | |||||||||
Hamilton2013 [55] | N/A | N/A | N/A | N/A | ? | N/A | N/A | ? | x |
Cross-sectional survey | |||||||||
Price andcolleagues2019 [16] | N/A | N/A | N/A | ? | ? | ✓ | N/A | ✓ | x |