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were significant difference in the 2 groups for FVC% (p < 0.001), FEV1% (p < 0.001) and FEV1/FVC% (p = 0.002). Multiple linear regression test showed that monthly household income significantly influence the FVC% predicted (b = 0.003, p < 0.001) and FEV1% predicted (b = 0.006, p < 0.001). In conclusion there was an inverse relationship between air naphtha concentrations and lung functions ability. Early impairment of the respiratory system is detected on the workers who are exposed to naphtha which made up of several chemicals.

Toxic effect of naphta exposure on respiratory system among workers in the tyre industry