Reference	Bias due to Exposure Assessment	Bias due to Confounding	Bias due to Selection of Participants	Bias due to Health Outcome Assessment	Bias due to Not Blinded Outcome Assessment	Total Risk of Bias
Barcelo Perez & Guzman Pineiro, Revista Cubana Hyg Epidemiol, 2008	High	High	High	Low	High	High
Belojevic, et al., J Environ Psychol, 2012	Low	Low	High	Low	Low	Unclear
Black et al., J Air Transp Manag, 2007	Low	High	Low	Low	Low	Low
Bocquier et al., Eur J Public Health, 2013	Low	Low	Low	High	Low	Low
Brink et al., Environ Int, 2011	Low	Low	Low	High	Low	Unclear
Clark et al., Am J Epidemol, 2012	Low	Low	Low	Low	Low	Low
Clark et al., J Enviro Psychol, 2013	Low	Low	Low	Low	Low	Low
Crombie et al., Enviro Health, 2011	Low	Low	Low	Low	Low	Low
Floud et al., Occup Environ Med, 2011	Low	Low	Low	Low	Low	Low
Fooladi, J Environ Public Health, 2012	High	High	High	High	High	High
Halonen et al., Scand J Work Environ Health, 2014	Low	Low	Low	Low	Low	Low
Hardoy et al., Soc Psychiatry Psychiatr Epidemiol, 2005	High	High	High	High	Low	High
Heritier et al., 2014	Low	Low	High	Low	Low	Unclear
Hjorteberg et al., Env Health Perspect, 2015	Low	Low	Low	Low	Low	Low
Honold et al., J Environ Psychol, 2012	Unclear	Unclear	High	Low	Low	High
Kishikawa, et al., Noise Health, 2009	Low	High	Unclear	Low	Low	High
La Torre et al., J Public Health, 2007	High	High	High	Low	Unclear	High
Roswall et al., PLOS One, 2015	Low	Low	Low	Low	Low	Low
Schreckenberg et al., Int J Environ Res Public Health, 2010	Low	Low	Unclear	Low	Low	Unclear
Schreckenberg et al., Noise & Health, 2010	Low	Low	Low	Low	Low	Low
Schreckenberg et al., NORAH study, 2015	Low	Low	High	Low	Low	Unclear
Stansfeld et al., JEP, 2009 RANCH	Low	Low	Low	Low	Low	Low
Stansfeld et al., Lancet, 2005	Low	Low	Low	Low	Low	Low
Stansfeld et al., Noise Health, 2009	Low	Low	Low	Low	Low	Low
Sygna et al., Environ Res, 2014	Low	Low	Low	Low	Low	Low
Tiesler et al., Enviro Res, 2013	High	High	High	High	High	High
Urban & Maca, Int J Environ Res Public Health, 2013	Low	High	Low	High	Low	High
Van Kempen et al., J Acoust Soc Am, 2010	Low	Low	Low	Low	Low	Low
Welch et al., Noise and Health 2013	High	High	High	Low	Low	High