Table A10.

Reviewer’s judgement on risk of bias in studies on aircraft noise and diabetes.

Study	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
SDPP [34]	Low	Low	High	Low	Low	Low
AWACS-1 [28]	Low	Low	High	High	Low	High

* In order to score “low”, the study should contain information that can be used to derive effect estimates that are at least adjusted for age, sex, and smoking; ^† In order to score “low” participants had to be randomly sampled from a known population and the response rate of the study had to be higher than 60%. Studies with a purposeful sample also scored “low”.