Additional Table 1.

The quality assessment of the included trials

Study	Selection bias	Study design	Confounders	Blinding	Data collection	Withdrawals and dropouts	Intervention integrity	Analysis appropriate to question	Global rating
Kohsakaetal., 1999	1	1	1	3	1	1	1	1	2
O’Brien and O’Connor, 2000	1	1	1	2	1	1	1	1	1
Cajochen et al., 2005	1	1	1	3	1	2	1	1	2
Crasson and Legros, 2005	1	1	1	1	1	1	1	1	1
Hansen et al., 2005 3	3	1	1	2	1	3	1	1	3
Ruger et al., 2006	1	1	1	3	1	1	1	1	2
Takasu et al., 2006	3	1	1	3	1	1	1	1	3
Viola et al., 2008	1	1	1	2	1	2	1	1	1
Chellappa et al., 2012	1	1	1	3	1	1	1	1	2
Santhietal., 2012 1	1	1	1	3	1	1	1	1	2
Sahin and Figueiro, 2013 1	1	1	1	3	1	1	1	1	2
Sahinetal., 2014 1	1	1	1	3	1	1	1	1	2
Leichtfried et al., 2015 1	1	1	1	3	1	2	1	1	2
Okamoto and Nakagawa, 2015 1	1	1	1	3	1	1	1	1	2
Muenchetal., 2016 1	1	1	1	3	1	1	1	1	2
Borragan et al., 2017 1	1	1	1	3	1	2	1	1	2
Rahman etal., 2017 1	1	1	1	2	1	1	1	1	1
Rodriguez-Morilla et al., 2017 1	1	1	1	3	1	1	1	1	2
Hartstein etal., 2018 1	1	1	1	2	1	2	1	1	1
Kazemi etal., 2018 1	1	1	1	3	1	1	1	1	2
Cajochen etal., 2019 1	1	1	1	3	1	1	1	1	2
Choi etal., 2019 1	1	1	1	3	1	1	1	1	2
deZeeuwetal., 2019 1	1	1	1	3	1	1	1	1	2
Smotek etal., 2019 1	1	1	1	3	1	1	1	1	2
Studer etal., 2019 1	1	1	1	2	1	2	1	1	1
teKulve etal., 2019 1	1	1	1	3	1	1	1	1	2
Yang etal., 2019 1	1	1	1	3	1	1	1	1	2
Park et al., 2020 1	1	1	1	3	1	1	1	1	2
Zhou etal., 2021 1	1	1	1	3	1	1	1	1	2

1: Strong; 2: moderate; 3: weak.