Table 3 Methodological quality assessment
From: How to effectively obtain informed consent in trauma patients: a systematic review
Bhangu et al. (2008, US) | Sahin et al. (2010, Turkey) | Khan et al. (2012, UK) | Clarke et al. (2018, Ireland) | Rossi et al. (2004, UK) | Smith et al. (2012, UK) | Kim et al. (2018, Korea) | Lin et al. (2018, Taiwan) | |
|---|---|---|---|---|---|---|---|---|
Non-randomized studies | ||||||||
 Case definition | ✓ | ✓ | ✓ | ✓ | ||||
 Representativeness of the cases | X | X | ✓ | X | ||||
 Ascertainment of exposure | ✓ | ✓ | ✓ | |||||
 Same method of ascertainment | ✓ | ✓ | ✓ | |||||
 Non-response rate | ✓ | ✓ | ✓ | ✓ | ||||
 Selection of controls | ✓ | |||||||
 Definition of controls | ✓ | |||||||
Randomized controlled trials | ||||||||
 Sequence generation | X | ✓ | ✓ | ✓ | ||||
 Allocation sequence concealment | X | X | X | ✓ | ||||
 Blinding of outcome assessment | ✓ | X | X | ✓ | ||||
 Incomplete outcome data | ✓ | ✓ | ✓ | ✓ | ||||
 Selective outcome reporting | ✓ | ✓ | ✓ | ✓ | ||||
 Other potential threats to validity | ✓ | ✓ | ✓ | ✓ | ||||