Table 5.

ORs for key factors influencing HFNIHL prevalence

No	Factor	Group	HFNIHL (%)	Overall weighted OR for HFNIHL	95% CI
1	Noise	Noise	28.7	5.63	4.03 to 7.88
		Control	9.9
2	Complex noise	Complex noise	34.5	1.95	1.06 to 7.84
		Gaussian noise	25.6
3	Coexposure	Coexposure	54.2	2.36	1.92 to 2.92
		Noise	30.3
4	Sex	Male	17.5	2.26	1.62 to 3.19
		Female	7.2
5	Age	Age >33 years	29.8	1.35	1.30 to 1.40
		Age ≤33 years	23.9
6	Exposure duration	≤10 years	25.1	1.75	1.64 to 1.87
		>10 years	37.0

HFNIHL, high-frequency noise-induced hearing loss.;