Table 2.
Risk of bias assessment according to the Cochrane collaboration's risk of the bias assessment tool
| Study, year (reference) | Random sequence generation | Allocation concealment | Blinding of participants and personnel | Blinding of outcome assessment | Incomplete outcome data | Selective reporting | Overall assessment of risk of bias |
|---|---|---|---|---|---|---|---|
| Sofie Hertz Rønn (2021) | L | U | L | L | L | L | L |
| Fatemeh Rahimi Sakak1 (2020) | L | L | L | L | L | L | L |
| Miles D. Witham (2020) | L | L | L | L | H | L | L |
| Tarkesh (2020) | L | L | L | L | L | L | L |
| Karamzad (2020) | L | L | L | L | L | L | L |
| Theodora Oikonomaki (2019) | U | U | H | H | L | L | H |
| Anthony G. Mansour (2017) | U | U | U | U | L | L | U |
| R.L. FULTON (2016) | L | L | L | L | H | L | L |
| Sousan Kolahi (2015) | U | U | L | U | L | L | U |
| H Rasekhi (2015) | U | L | L | L | L | L | L |
| Ilona Kurnatowska1 (2015) | L | L | L | L | L | L | L |
| Noriko Koitaya (2013) | L | U | L | L | L | L | L |
| G.W. Dalmeijer (2012) | L | L | L | L | L | L | L |
| Rajiv Kumar (2010) | U | U | L | L | L | L | U |
| Noriko Koitaya (2008) | L | U | L | L | L | L | L |
| Makiko Yoshida (2008) | U | U | L | L | L | L | U |
| Mette Kristensen (2008) | U | U | L | L | L | L | U |
L, low; H, high; U, unclear.