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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.