In manual pure-tone audiometry of screenign test, Changes of hearing threshold level(HTL) might results, for example, from environmental noise of testing site, time-interval after noise exposure and so on. To assess degree of the change of HTL in
screenig teest, HTLs screening and diagnostic test for 345 workers were checked and differences of HTLs between screening and diagnostic tests obtained, their age, sex and working duration were also investigated.
Mean difference of HTL between screening and diagnostic tests was 13 dB in 1.000 Hz and 5 dB in 4,000 Hz for both ears. In frequency 1,000 Hz, it was increased in both ear as the HTL of screening test(STHL) increases.
In each multiple regression analysis by stepwise method on HTLs of diagnostic test(DHTLs) as dependent variables, any independent variables of age, sex and working duration were not selected for equation. Regression equation and R square for DHTL
of
1,000 and 4,000 Hz was 0.710428×SHTL of 1,000 Hz)-3.584088 and 0l.62698, and 1.000811×(SHTL of 4.000 Hz)-5.028477 and 0.98821, respectively.
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