| Summary: | 碩士 === 國立臺灣大學 === 職業醫學與工業衛生研究所 === 89 === Objective：We have two objectives in this study. First, we will develop a model to perform proactive and cyclic risk assessments in workplace. We will also apply such a model to an automobile manufacturing plant. Second, we will investigate the relationship between blood pressure and occupational noise exposure for automobile manufacturing workers. Method：The framework of the National Taiwan University Workplace Risk Assessment model (NTU-WRA) was beads on the British risk assessment guideline (BS8800) and American Industrial Hygiene Association’s (AIHA) exposure assessment guideline, which quantitatively ranks health risks in workplace by integrating the health effect of hazard, exposure levels, likelihood and the number of workers in individual operational units. In our model, we calculate risk index from the above 4 factors based on an order-of-2 classification system. An automobile manufacturing plant with 6 department and 35 operational units was used as an example to test the applications of the NTU-WRA. We selected 15 male workers with noise exposures greater than 70 dBA and 5 male workers with noise with noise exposures less than 40 dBA in an auto industry to investigate the relationship between noise and blood pressure. DynaPulse continuously monitored worker’s ambulatory blood pressure for 24 hours. Logging Noise Dose Meter continuously monitored worker’s noise exposure levels for 16 hours. Linear regression models were used to analyze the data with confounding factors being controlled. Results: The NTU-WRA is a risk assessment model with sound logics and good quantitative capability. Among 35 operational units in the 6 departments, the NTU-WRA ranked a serious risk of EMF for the body shop. The model ranked high risks for noise in the stamp, engine, body shop, paint and assembly shops, for vibration in the engine and assembly shops, and for metal working fluid in the machine shop. For the relationship between occupational noise and blood pressure, we found systolic blood pressure and mean arterial pressure in male workers with occupational noise exposure were significantly higher than with non-occupational noise exposure.
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