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Newcastle–Ottawa scale (modified for cohort studies) for assessment of quality of included studies.
| Study | Selection score | Comparability score | Outcome score | Total score |
| Mitus 201915 | *** | *** | 6 | |
| Choi 201816 | **** | ** | 6 | |
| Sevinc 201817 | *** | ** | 5 | |
| Ganesh 201818 | ** | * | * | 4 |
| Borhani-Khomani 201619 | *** | * | *** | 8 |
| Onkendi 201420 | *** | ** | 5 | |
| Lin 201321 | *** | * | ** | 6 |
| Abdalla 200622 | *** | ** | 5 | |
| Asoglu 200423 | *** | ** | 5 | |
| Kapiris 200124 | ** | * | *** | 6 |
An asterisk (*) denotes fulfilment of each criterion.
