Table 3.

Association between AI and the audiogram shapes of hearing loss stratified by sex and age

Audiogram shapes	For men				For women
	N	AI	OR (95% CI)	P	N	AI	OR (95% CI)	P
For age ≤60 years
Normal	927	2.86 ± 0.97	1 (reference)		937	2.24 ± 0.79	1 (reference)
Flat shape	74	2.97 ± 1.14	1.12 (0.89–1.42)	0.346	35	2.45 ± 0.81	1.39 (0.94–2.05)	0.102
2–4 kHz abrupt loss	52	2.85 ± 0.91	0.99 (0.74–1.33)	0.947	26	2.91 ± 0.99a	2.19 (1.52–3.17)	<0.001
Sloping shape	121	2.95 ± 0.87	1.10 (0.91–1.33)	0.346	123	2.48 ± 0.82	1.44 (1.16–1.80)	0.001
For age >60 years
Normal	215	2.59 ± 0.85	1 (reference)		222	2.67 ± 0.76	1 (reference)
Flat shape	35	2.98 ± 0.96	1.45 (1.04–2.03)	0.028	47	2.65 ± 0.96	0.98 (0.69–1.39)	0.901
2–4 kHz abrupt loss	120	2.73 ± 1.03	1.17 (0.93–1.47)	0.192	58	2.64 ± 0.93	0.96 (0.69–1.33)	0.812
Sloping shape	222	2.60 ± 1.02	1.01 (0.83–1.24)	0.915	200	2.81 ± 1.05	1.18 (0.96–1.45)	0.121

^aThe index is the largest with significant difference in the subgroup.