Fig. 1From: Effect of GRM7 polymorphisms on the development of noise-induced hearing loss in Chinese Han workers: a nested case-control studyThe interpretation of CNE equation. Where Tref is equal to 1; n is the total number of different positions for the workers exposed to noise; i is the number of different posts; T is the time at different positions; LAeq, 8h is the equivalent continuous sound level of 8Â h for different jobsBack to article page