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Table 1 The statistics of hearing thresholds at frequencies of subjects grouped by age

From: Extended high-frequency audiometry in healthy adults with different age groups

Frequency (kHz)

Hearing threshold (dB HL) M (QL, QU)

21–30 years

31–40 years

41–50 years

51–60 years

61–70 years

0.25–2

10.00 (6.50,10.00)

7.50 (5.00,11.25)

10.00 (8.75,15.00)

13.75 (10.00,22.50)*

18.75 (11.25,32.50)*

4

10.00 (6.50,10.00)

10.00 (5.00,20.00)

15.00 (10.00,25.00)*

25.00 (15.00,50.00)*

40.00 (25.00,60.00)*

6

10.00 (6.50,10.00)

15.00 (7.50,35.00)*

17.50 (15.00,25.00)*

40.00 (15.00,60.00)*

45.00 (35.00,55.00)*

8

10.00 (6.50,10.00)

15.00 (5.00,30.00)*

20.00 (10.00,25.00)*

40.00 (15.00,60.00)*

50.00 (35.00,60.00)*

9

10.00 (10.00,15.00)

15.00 (10.00,47.50)*

27.50 (16.25,40.00)*

50.00 (28.75,75.00)*

60.00 (55.00,70.00)*

10

10.00 (10.00,15.00)

30.00 (12.50,45.00)*

32.50 (20.00,50.00)*

60.00 (28.75,75.00)*

70.00 (60.00,80.00)*

11.5

10.00 (10.00,20.00)

40.00 (17.50,52.50)*

45.00 (30.00,63.75)*

62.50 (36.25,80.00)*

75.00 (61.25,85.00)*

12.5

15.00 (10.00,20.00)

50.00 (25.00,65.00)*

55.00 (35.00,75.00)*

65.00 (51.25,83.75)*

75.00 (70.00,85.00)*

14

20.00 (10.00,30.00)

60.00 (46.25,73.75)*

65.00 (50.00,80.00)*

70.00 (60.00,75.00)*

75.00 (70.00,80.00)*

16

25.00 (10.00,45.00)

50.00 (35.00,55.00)*

55.00 (50.00,60.00)*

55.00 (55.00,60.00)*

NA

18

20.00 (10.00,30.00)

NA

NA

NA

NA

20

10.00 (10.00,15.00)

NA

NA

NA

NA

  1. *, significantly different (p < 0.05) from that of the 21–30 group
  2. , significantly different (p < 0.05) from that of the 31–40 group
  3. ▲, significantly different (p < 0.05) from that of the 41–50 group
  4. ■, significantly different (p < 0.05) from that of the 51–60 group
  5. M (QL, QU), Median (lower quartile, upper quartile)
  6. NA, not applicable since the response was equivalent or smaller than 20%