PURPOSE: investigate the difference in the signal to noise ratio in subjects exposed and not exposed to occupational noise, with and without hearing loss using the Hearing in Noise Test, version in Portuguese of Brazil. METHOD: 206 subjects, 49 females and 157 males were evaluated and divided : 56 normal hearing without noise exposure (Group 1); 70 normal hearing exposed to occupational noise (Group 2); 80 exposed occupational noise with sensorineural hearing loss (Group 3). We analyzed the signal to noise ratio using the HINT Brazil in four presentation conditions: S-no noise, NF-noise front, NR-noise right, NL- noise left; RC-noise composite (weighted average of presentations with noise ) and the results were recorded in dB. RESULTS: the mean values obtained were: G1: 25.0 (S), -5.0 (NF), -12.3 (NR), -12.4 (NL) and -8.7 (NC); G2 : 26.4 (S), -4.7 (NF), -11.9 (NR), -11.9 (NL) and -8.3 (NC); G3: 34.1 (S) - 2.8 (NF), -8.9 (NR), -8.8 (NL), -5.8 (NC). CONCLUSION: there was significant difference between the values of the group of unexposed subjects (G1) with the above (G2) only on condition Noise Composite (NC). The group of subjects with hearing loss (G3) showed a significant difference in the groups G1 and G2, with worse performance in all conditions. The worst performance for speech understanding in noise was related to the degree of hearing loss and noise exposure.
Hearing; Speech Perception; Hearing Tests; Speech Discrimination Tests; Noise
