Table 2.

Assessment of the methodological quality of studies included in the meta-analysis on aircraft noise exposure and hypertension

Study	In peer-reviewed literature	Type of study	Validity of outcome assessment	Control of possible confounding variables	Response rate >80%	Total score
Rosenlund et al.[6]	3	1	3	3	0	10
Knipschil[13]	3	1	3	0	NA	7
GOTO[16]	3	1	3	2	NA	9
Eriksson et al.[17]	3	3	3	3	NA	12
Black[22]	3	1	3	2	0	9