Table 2. Prevalence of hearing impairment (more than 25 dB in the better ear) at each frequency by decade age.
| Prevalence (%) | |||||||
|---|---|---|---|---|---|---|---|
| Age | 500 Hz | 1000 Hz | 2000 Hz | 3000 Hz | 4000 Hz | 6000 Hz | |
| Total | 19–29 | 0.7(0.2) | 0.4(0.2) | 0.4(0.2) | 0.8(0.2) | 1.3(0.3) | 4(0.5) |
| 30–39 | 0.9(0.2) | 0.6(0.2) | 0.9(0.2) | 1.9(0.3) | 4.3(0.4) | 10.7(0.7) | |
| 40–49 | 1.9(0.3) | 1.8(0.3) | 3.1(0.4) | 8.7(0.6) | 16.5(0.7) | 30.8(0.9) | |
| 50–59 | 5.2(0.4) | 5.4(0.5) | 9.2(0.6) | 18.9(0.9) | 29.9(0.9) | 51.3(1.1) | |
| 60–69 | 15.2(0.9) | 16(0.8) | 27.4(1) | 42.7(1.1) | 54.3(1.1) | 79.5(0.9) | |
| 70≥ | 35.3(1.2) | 38.2(1.3) | 53.7(1.2) | 70.7(1.1) | 78.4(1) | 93.2(0.6) | |
| P-value | < .0001 | < .0001 | < .0001 | < .0001 | < .0001 | < .0001 | |
| Male | 19–29 | 0.9(0.4) | 0.5(0.3) | 0.4(0.2) | 1(0.4) | 1.5(0.4) | 4.8(0.9) |
| 30–39 | 0.8(0.3) | 0.5(0.2) | 1.1(0.3) | 2.9(0.5) | 7.2(0.8) | 14.9(1) | |
| 40–49 | 1.7(0.4) | 2(0.4) | 3.9(0.6) | 14.1(1) | 28.5(1.3) | 39.8(1.4) | |
| 50–59 | 4.7(0.6) | 5(0.7) | 10.4(1) | 27.4(1.5) | 45(1.6) | 59.8(1.6) | |
| 60–69 | 13.7(1.2) | 15(1.2) | 29.5(1.6) | 51.7(1.6) | 69.8(1.4) | 85.2(1.1) | |
| 70≥ | 31.5(1.6) | 35.3(1.8) | 54.2(1.7) | 75.3(1.5) | 86.6(1.3) | 94.7(0.8) | |
| P-value | < .0001 | < .0001 | < .0001 | < .0001 | < .0001 | < .0001 | |
| Female | 19–29 | 0.4(0.2) | 0.3(0.2) | 0.5(0.3) | 0.6(0.3) | 1(0.4) | 3(0.6) |
| 30–39 | 1(0.3) | 0.8(0.3) | 0.6(0.2) | 0.8(0.2) | 1.2(0.3) | 6.3(0.7) | |
| 40–49 | 2.2(0.4) | 1.6(0.3) | 2.4(0.4) | 3(0.5) | 4(0.5) | 21.4(1.1) | |
| 50–59 | 5.6(0.6) | 5.7(0.7) | 8.1(0.7) | 10.7(0.8) | 15.1(1) | 42.9(1.4) | |
| 60–69 | 16.6(1.2) | 16.9(1.2) | 25.3(1.3) | 34.2(1.4) | 39.7(1.5) | 74(1.4) | |
| 70≥ | 37.9(1.6) | 40.3(1.7) | 53.4(1.6) | 67.5(1.6) | 72.7(1.4) | 92.2(0.8) | |
| P-value | < .0001 | < .0001 | < .0001 | < .0001 | < .0001 | < .0001 | |
The prevalence of hearing impairment increased with advancing years in all frequencies. Values are presented as number (%) and Chi-square test was used to analyse the statistical difference between the prevalence rates of each group.