Medical Journal of The Islamic Republic of Iran (MJIRI)

  Abstract

  Background: Previous studies have indicated an unspecific correlation between noise

  exposure and blood pressure disturbances. Blood pressure disturbances could be caused

  by the environmental hazards such as noise exposure. The aim of this study is to analyze

  whether there is a relationship between noise exposure and hypertension.

  Methods: Atotal sample of 218 workers working in a small workshop aged between 27

  and 49 yrs answered the questionnaire in this survey. Blood pressure was measured in the

  sitting position after 5 minutes rest. Level of sound intensity in the workplace was measured

  by sound level meter (SKC Model CEL-480-440) and human noise exposure level

  was measured by audiometric device (MEVOX). The correlation between industrial noise

  and blood pressure was extracted. The t-test and Fisher’s exact test was used to compare

  the qualitative variables and quantitative variables with normal distribution as being applied

  in parametric tests. Odds ratio (OR) with 95% confidence interval (95% CI) was used

  to compare the magnitude of risk variables.

  Results: Sub-populations in this study consisted of 109 workers with noise exposure

  more than 85 dB (Case group) and the rest (i.e. 109 workers) with noise exposure less than

  85 dB (Control group). High level systolic and diastolic blood pressure was more prevalent

  in the case group. Total hearing loss more than 25dB was significantly more prevalent in

  the case group (45% of case group have hearing loss). Adjusted Odds Ratio (OR) for the effect

  of age, food type and BMI on blood pressure was 3.56 (95% CI: 6.6 – 1.9).

  Conclusion: This study showed that high blood pressure (>_140/90 mmHg) was more

  prevalent in the case group. This finding persisted after adjustment was made for age, food

  type, and BMI. (Odds Ratio 3.56 (95% CI: 6.6 – 1.9)).