Table 4.

Summary of incomplete data and sources of bias for all included studies.

Author	Randomization	Allocation	Attrition	Overall Risk of Bias
Phelan et al. 2013 [35]	LOW	LOW	LOW	LOW
Vesco et al. 2016 [36]	LOW	UNCLEAR	HIGH	MODERATE
Vinter et al. 2014 [37]	LOW	LOW	HIGH	MODERATE
Ferrara et al. 2011 [38]	LOW	LOW	LOW	LOW
Herring et al. 2017 [39]	LOW	LOW	LOW	LOW
Peccei et al. 2017 [40]	LOW	LOW	HIGH	MODERATE
Bertz et al. 2012 [41]	LOW	LOW	LOW	LOW
Colleran et al. 2012 [42]	LOW	UNCLEAR	LOW	LOW
Craigie et al. 2011 [43]	LOW	LOW	HIGH	MODERATE
Falciglia et al. 2017 [44]	UNCLEAR	UNCLEAR	HIGH	HIGH
Gilmore et al. 2017 [45]	UNCLEAR	UNCLEAR	LOW	MODERATE
Herring et al. 2014 [46]	LOW	LOW	LOW	LOW
Huseinovic et al. 2016 [47]	LOW	LOW	LOW	LOW
Lovelady et al. 2000 [48]	LOW	UNCLEAR	LOW	LOW
Nicklas et al. 2014 [49]	LOW	LOW	LOW	LOW
Østbye et al. 2009 [50]	LOW	UNCLEAR	HIGH	MODERATE
Wilkinson et al. 2015 [51]	LOW	LOW	HIGH	MODERATE
Wiltheiss et al. 2013 [52]	UNCLEAR	UNCLEAR	HIGH	HIGH