Table 2.
Quality assessment of included cohort studies using the Newcastle–Ottawa Scale
| Author | Selection | Comparability | Outcome | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Representativeness of exposed cohort |
Selection of non- exposed cohort |
Ascertainment of exposure |
Demonstration that outcome of interest was not present at start of study |
Preoperative demographic risks |
Other TKA risk factors |
Assessment of outcome |
Follow-up > 1 year |
Loss to follow- up rate < = 10% |
Total quality score |
|
| Wang (2021) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 8 |
| Zhang (2020) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 8 |
| Lin (2020) | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 0 | 7 |
| Shi (2020) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 8 |
| Esposito (2020) | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 7 |
| Samy (2018) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 8 |
|
Papagiannis (2016) |
1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 0 | 7 |
| Choi (2016) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 8 |
| Bae (2016) | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 8 |
| Anderson (2002) | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 8 |
Preoperative demographic risks included age, BMI, sex, if all characteristics were comparable, 1 point was assigned; Other TKA risk factors included single surgeon, or bilateral knee or same surgical approach, anyone of them was comparable, 1 point was assigned; Otherwise, 0 points were assigned.