Table 3.
Assessment of the quality of included studies according to the newcastle-ottawa quality assessment scale for RCTs.
| Selection |
Comparability | Exposure |
||||||
|---|---|---|---|---|---|---|---|---|
| STUDY | Case Definition | Case Representativeness | Selection of Controls | Definition of Controls | Comparability | Ascertainment of Exposure | Same Method for Cases and Controls | Non-response Rate |
| GENERAL | ||||||||
| Gibson et al., 2017 | * | * | * | * | * | * | * | * |
| Righesso et al., 2007 | * | * | * | * | * | * | * | * |
| LOCAL ± EPIDURAL | ||||||||
| Chen et al., 2020 | * | * | * | * | * | * | * | * |
| Chen et al., 2018 | * | * | * | * | * | * | * | * |