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. 2014 May 16;13:37. doi: 10.1186/1476-069X-13-37

Figure 1.

Figure 1

The association between hypertension and road traffic noise frequency at 63 Hz for study subjects. The analysis was adjusted for gender, age, body mass index, smoking status, alcohol consumption, salt intake, physical activity, family history of hypertension and the total traffic flow rate.