New frequent visibility from audio in work environment surroundings, the brand new highest prevalence from blood pressure level international, brand new physical plausibility of the connection between noise coverage and you will higher blood circulation pressure plus the dependence on a lot more degree investigating the brand new low-auditory outcomes of exposures to lower than 85 dB(A), were the reasons that provided us to create this study.
Investigation construction and you may population
To address the main case of the new relationship between noise visibility and you may elevated blood pressure, i performed a mix-sectional studies design of existent supplementary health and noises exposure research off 2007 pertaining to pros out-of an effective petrochemical and you will energy refinery for the Rio de Janeiro, Brazil.
The fresh analyzed device possess 2 kinds of work force: builders (workers paid because of the bodies) and you can sub-designers (pros paid off from the outsourcing companies). Both workforces was at dating sites the mercy of various other labor rules and all sorts of outsourced providers have to perform pre-entryway and you may yearly health test in almost any employee. Subcontracted labor force are implementing the fresh bush restoration and you will extension, whenever you are authorities workers had been significantly more involved in administrative work in the plant. We utilized the six-times timeframe to assure the absolute minimum chronilogical age of appears visibility until the analysis away from blood pressure level.