<![CDATA[ABSTRACT Background: Chronic exposure of volatile substances can cause the impaired olfactory function. Objective: To identify the difference of olfactory function at Gas Station workers in Medan city. Method: Cross-sectional analitic study. A total of 80 persons consisting of 40 gas station operators and 40 non-operators who fulfilled the inclusion criteria. The applied statistical analysis was Mann Whitney, Fisher's Exact, Chi Square, T independent, Spearman with 95% confidence level. Result: Proportion of the impaired olfactory function in the gas station operator group by 77.5% and non-operator group by 0%. Significant correlation was obtained between age, duration of work with the impaired olfactory function (p = 0,047, p = 0,001). The gas station operators will suffer the impaired olfactory function if they works for ≥ 3.89 years. Conclusion: There were differences of olfactory functions on the gas station workers by using Sniffin 'Sticks Test.]]>
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