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Table 3 Comparisons of pure tone audiometry threshold according to the smoking amount in current smoker

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

Frequency Smoking amount (pack-years) p value Post-hoc comparison
0.05–9.9 *(n = 1,125) 10–19.9 *(n = 1,413) 20–29.9 *(n = 689) ≥30 *(n = 366)
1 kHz 15.2 (0.3) 15.2 (0.3) 15.3 (0.4) 16.9 (0.6) 0.030 a,b,c < d
2 kHz 17.5 (0.4) 17.2 (0.3) 18.1 (0.5) 20.1 (0.7) 0.002 a,b,c < d
3 kHz 25.1 (0.5) 23.7 (0.4) 25.2 (0.6) 27.2 (0.9) 0.001 b < a,c < d
4 kHz 30.5 (0.6) 29.3 (0.5) 30.8 (0.7) 31.5 (0.9) 0.075 -
  1. mean (standard error).
  2. *a: 0.05–9.9, b: 10–19.9, c: 20–29.9, d: ≥30 pack-years.
  3. p-value was calculated by ANCOVA and adjusted for age, working period, noise level, body mass index, mean arterial pressure, fasting blood glucose, total cholesterol, triglyceride, HDL cholesterol, hemoglobin.