Table 2.

Mental health, wellbeing and quality of life: risk of bias.

Reference	Bias due 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
Weyde, Envt Health, 2017	Low	Low	High	Unclear	Low	High
Feder et al., Environ Res, 2015	Low	Low	Low	Low	Low	Low
Seidler et al., Environ Res, 2017	Unclear	Low	Low	Low	Low	Unclear
Welch et al., Noise Health, 2018	Low	Unclear	Low	Low	Low	Unclear
Klatte et al., Environ & Behavior, 2016	Low	Low	Low	Low	Low	Low
Dzhambov et al., Environ Res, 2018a	Low	Low	Unclear	Low	Low	Unclear
Generaal et al., Psychol Med, 2019	Low	Low	High	Low	Low	Unclear
Dzhambov et al., Environ Res, 2018b	Low	Low	Unclear	Low	Low	Unclear
Dzhambov et al., Environ Int., 2017	Low	Low	Unclear	Low	Low	Unclear
Zock et al., Environ Int., 2018	Low	Low	Low	Low	Low	Low
Lim et al., Noise Health, 2018	Low	Low	High	Low	Low	Unclear
Forns et al., Enviro Health Perspectives, 2016	Low	Low	Low	Low	Low	Low
He et al., Environ Res., 2019	Low	Low	Unclear	Low	Low	Unclear
Civil Aviation Authority, 2017	Low	High	Low	Low	Low	Unclear
Van Aart et al., Environ Int., 2018	Low	Low	High	Low	Low	Unclear
Klompmaker et al., Environ Int., 2019	Low	Low	Unclear	Low	Low	Unclear
Okokon et al., Environ Int., 2018	Low	Low	Unclear	Low	Low	Unclear
Oiamo et al., Soc Sci Med., 2015	Low	High	Unclear	Low	Low	Unclear
Leijssen et al., IJERPH, 2019	Low	Low	Low	Low	Low	Low
Zijlema et al., Int. J Hygiene E Health., 2015	Low	Low	Unclear	Low	Low	Unclear
Wallas et al., Int. J Hygiene E Health., 2018	Low	Unclear	High	Low	Low	Unclear
Lawton et al., Transport Res Part D., 2016	Low	Low	Low	Low	Low	Low
Wright et al., Environ Health., 2018	Low	Low	Low	Low	Low	Low
Zijlema et al., Internoise., 2019	Low	Low	Unclear	Low	Low	Unclear