Table 1.

Summary of level of bias of individual studies

Study	Random sequence generation	Baseline characteristics	Allocation concealment	Random housing	Blinding (performance)	Random outcome assessment)	Blinding (detection)	Incomplete outcome data	Selective outcome reporting	Other sources of bias	Overall risk of bias
Yates et al. (2017)	Some	Some	Some	Some	Some	Some	Low	Some	Low	Some	Some
Liu et al. (2018)	Low	Low	Some	Some	High	Some	Some	Some	Low	Some	High
Hu et al. (2019)	Some	Low	Some	Some	High	Some	Low	Low	Low	High	High
Domergue et al. (2016)	Some	Low	Some	Some	Some	Some	Some	Low	Low	Some	Some
Liu et al. (2014)	Some	Low	Some	Some	Some	Some	Some	High	Low	Some	High
Yates et al. (2017)	Some	Low	Some	Some	Some	Some	Low	High	Low	Some	High
Liu et al. (2014)	Low	Low	Some	Some	Some	Some	Some	High	Low	Some	High
Hu et al. (2020)	Some	Some	Some	Some	Some	Some	Some	High	Low	High	High
Li et al. (2016)	Low	Some	Some	Some	Some	Some	Some	Low	Low	Some	Some
Zhang et al. (2015)	Some	Low	Some	Some	High	Some	Some	Low	Low	High	High
Foubert et al. (2017)	Some	Low	Some	Some	High	Some	Some	High	Low	High	High