Table 4.

Risk of bias assessment for included RCTs according to the Cochrane guidelines

Study	Random sequence generation	Allocation concealment	Blinding of participants and personnel	Blinding of outcome assessment	Incomplete outcome data	Selective reporting	Other bias
Gjevold et al 2016	Low	Unclear	High	High	Low	Low	Low
Benic et al 2016	Low	Unclear	High	High	Low	Low	Low
Joda and Bragger 2016	Low	Unclear	High	High	Low	Low	Low
Sakorniwon et al 2017	High	High	High	High	Low	High	Low
Haddadi et al 2018	Unclear	Unclear	High	High	Low	Low	Low
Sailer et al 2019	Low	Low	High	High	Low	Low	Low
Ahnberg et al 2016	Low	Unclear	High	High	Low	Low	Low
Cappare et al. 2019	Low	Low	High	High	Low	Low	Low
Lee et al. 2021	Low	Low	High	High	Low	Low	Low