Table 2.
Methodological assessment
| Study | Oxford level of evidence | Representativeness of exposed cohort | Selection of non‐exposed cohort | Ascertainment of exposure | Demonstration that outcome of interest was not present at start of study | Assessment of outcome | Follow‐up duration | Follow‐up complete |
|---|---|---|---|---|---|---|---|---|
| Watanabe et al (2007) | 2b |
|
— |
|
— |
|
|
|
| Wiggans et al (2013) | 2b |
|
— |
|
— |
|
|
|
| Meguro et al (2014) | 2b |
|
|
|
— |
|
|
|
| Riediger et al (2014) | 2b |
|
— |
|
— |
|
|
|
| Pagano et al (2015) | 2b |
|
— |
|
— |
|
|
|
| Vibert et al (2015) | 2b |
|
— |
|
— |
|
|
|
| Lemke et al (2017) | 2b |
|
|
|
— |
|
|
|
, consistent with Newcastle‐Ottawa criteria; , partly consistent with Newcastle‐Ottawa criteria; , not consistent with Newcastle‐Ottawa criteria; —, not applicable.