The overall rural-to-urban prevalence rate ratio of hearing impairment by severity in Taiwan
| Year | Mild | Moderate | Severe | |||||||||
| Prev.† | Rate ratio | (95% CI) | Prev. | Rate ratio | (95% CI) | Prev. | Rate ratio | (95% CI) | ||||
| Rural | Urban | Rural | Urban | Rural | Urban | |||||||
| 2004 | 2.44 | 2.13 | 1.15 | (1.01 to 1.29)* | 2.03 | 1.92 | 1.06 | (0.93 to 1.21) | 3.42 | 3.47 | 0.99 | (0.89 to 1.09) |
| 2005 | 2.49 | 2.28 | 1.09 | (0.97 to 1.23) | 1.95 | 1.85 | 1.06 | (0.92 to 1.21) | 3.26 | 3.53 | 0.92 | (0.83 to 1.02) |
| 2006 | 2.69 | 2.38 | 1.13 | (1.00 to 1.27)* | 1.97 | 1.84 | 1.07 | (0.93 to 1.23) | 3.41 | 3.62 | 0.94 | (0.85 to 1.04) |
| 2007 | 2.59 | 2.41 | 1.08 | (0.95 to 1.22) | 2.09 | 1.86 | 1.12 | (0.98 to 1.29) | 3.31 | 3.50 | 0.95 | (0.85 to 1.05) |
| 2008 | 2.64 | 2.32 | 1.14 | (1.01 to 1.29)* | 2.12 | 1.76 | 1.21 | (1.05 to 1.39)* | 3.30 | 3.42 | 0.96 | (0.87 to 1.07) |
| 2009 | 2.93 | 2.35 | 1.25 | (1.10 to 1.40)* | 1.98 | 1.74 | 1.14 | (0.99 to 1.31) | 3.27 | 3.41 | 0.96 | (0.86 to 1.07) |
| 2010 | 2.95 | 2.45 | 1.21 | (1.07 to 1.36)* | 1.76 | 1.64 | 1.07 | (0.92 to 1.25) | 3.37 | 3.45 | 0.98 | (0.87 to 1.09) |
*P<0.05.
†Prev., the prevalence per 10 000 children, estimated by dividing the number of cases by the population in each age group in each year.