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Table 1 Classification of tympanograms in Aboriginal and non-Aboriginal children by age during routine follow-up by research assistants in the field or by audiologists at routine ENT follow-up.

From: Absent otoacoustic emissions predict otitis media in young Aboriginal children: A birth cohort study in Aboriginal and non-Aboriginal children in an arid zone of Western Australia

Age (months)

Tympanogram

Aboriginal

Non-Aboriginal

  

Field

Clinic

Field

Clinic

3–4

A

13 (52%)

5 (33%)

65 (77%)

17(68%)

 

B

11 (44%)

8 (53%)

9 (11%)

5(20%)

 

C

1 (4%)

2 (13%)

11 (13%)

3(12%)

5–9

A

11(36%)

8(22%)

66 (61%)

47(56%)

 

B

18 (58%)

26(72%)

30 (27%)

26(31%)

 

C

2 (6%)

2(6%)

13 (12%)

11(13%)

10–14

A

15 (40%)

7(19%)

63 (54%)

31(49%)

 

B

18 (49%)

25(69%)

26 (22%)

18(29%)

 

C

4 (11%)

4(11%)

27 (23%)

14(22%)

15–19

A

11 (39%)

5(22%)

48 (60%)

36(52%)

 

B

13 (46%)

15(65%)

16 (20%)

21(30%)

 

C

4 (14%)

3(13%)

16 (20%)

12(17%)

20 +

A

7 (21%)

2(20%)

54 (63%)

8(44%)

 

B

18 (53%)

6(60%)

14 (17%)

5(28%)

 

C

9 (26%)

2(20%)

17 (20%)

5(28%)