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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%