Application of Standardized Proportional Mortality Ratio to the Assessment of Health Risk in Relatively Healthy Populations: Using a Study of Cancer Risk in Telecommunication Workers with Excess Exposure to Acid Mists as an Example.

In a follow-up of that study, which studied gastric cancers as a whole with four more years of data (from 1984 to 1996), an increasing trend of risk with probability of exposure was observed in workers who had high-intensity of exposure only ( p < 0.01), and an increasing trend of risk with intensity of exposure was observed in all exposed workers combined ( p < 0.01) and in those who had a medium probability of exposure ( p < 0.05) [ 20 ].

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