Table 1: Excluded cases in smoker and non-smoker groups
Parameters Smoker workers Non-smoker workers
Diabetes mellitus 11 19
Hyperlipidemia 15 24
Hypothyroidism 3 4
Unilateral hearing loss 9 11
Conductive hearing loss 7 12
Ototoxic drug consumption 4 5
Severe or frequent ear infection 2 3
Major ear operations 2 2
Head trauma 2 3
Total 55 83