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Table 4 Adjusted odds ratio of hearing loss by frequencies according to the smoking amount in current smoker

From: Relationship of cigarette smoking and hearing loss in workers exposed to occupational noise

  1 kHz * 2 kHz * 3 kHz * 4 kHz *
  N OR 95% CI N OR 95% CI N OR 95% CI N OR 95% CI
Smoking amount
(pack-years)
            
0.05-9.9 1,125 1.000   1,125 1.000   1,125 1.000   1,125 1.000  
10-19.9 1,413 1.562 1.013–2.408 1,413 1.420 1.014–1.988 1,413 1.063 0.811–1.393 1,413 1.034 0.815–1.312
20-29.9 689 1.557 0.990–2.450 689 1.673 1.179–2.374 689 1.198 0.898–1.599 689 1.228 0.945–1.595
≥30 366 1.643 1.023–2.640 366 1.660 1.143–2.411 366 1.264 0.918–1.742 366 1.060 0.779–1.442
p for trend   0.263    0.197    0.314    0.387  
  1. * 1 k, 2 kHz: threshold ≥ 30 dBHL included hearing loss group, 3 k, 4 kHz: threshold ≥ 40 dBHL included hearing loss group.
  2. Adjusted for age, working period, noise level, body mass index, mean arterial pressure, fasting blood glucose, total cholesterol, triglyceride, HDL cholesterol, hemoglobin.