Table 2

Mean pure-tone averages (PTAs) and average air conduction thresholds from 125 Hz to 8 kHz as a function of age for affected individuals.

Age group (years)
21–30
31–40
41–50
51–60
61–70
Mean ± SD (years)
25.1 ± 2.6
36.6 ± 3
50 ± 0
58.3 ± 0.5
62.5 ± 1.7
Number of ears
(n = 14)
(n = 16)
(n = 4)
(n = 6)
(n = 4)
PTAs, (dBHL)





right ear
15.9 (11.9)
19.6 (13.8)
45.8 (10.6)
100.6 (33.7)
23.3 (14.1)
left ear
19 (19)
34 (37)
51.7 (2.3)
45.5 (9.2)
41.7 (30.6)
Air conduction thresholds





125 Hz
17.1 (16.1)
27.8 (29.8)
33.7 (4.7)
60 (47)
30 (20.4)
250 Hz
15.3 (15.1)
25.3 (28.4)
36.2 (8.5)
64.2 (43.6)
26.3 (22.5)
500 Hz
17.5 (17.5)
25.9 (28.1)
47.5 (5)
73.3 (36.8)
30 (23.8)
1 kHz
16.1 (13.7)
25.6 (28.5)
46.2 (7.5)
74.2 (36.1)
33.7 (21.7)
2 kHz
18.9 (21.7)
28.8 (30.1)
52.5 (11.9)
71.7 (39.3)
33.7 (22.8)
4 kHz
24.6 (19.8)
49.1 (30.1)
62.5 (6.4)
78.3 (32.6)
50 (10.8)
8 kHz
32.1 (31.8)
60.6 (27.6)
67.5 (8.7)
89.2 (25.4)
66.3 (20.2)

Data are given as mean (SD). DBHL = decibels hearing level.

Germain et al. BMC Medical Genetics 2002 3:10   doi:10.1186/1471-2350-3-10