TABLE 5.
Changes in the Prevalence of Presenting Vision Impairment (<20/63 to 20/400) and Blindness (<20/400) Between the 2006 and 2014 Surveys
| Presenting Visual Acuity | |||||
|---|---|---|---|---|---|
| Prevalence (95% Confidence Interval) | Prevalence Changea | ||||
| Degree of Impairment, by Site | 2006 Survey Actual | 2006 Survey Standardizedb | 2014 Survey Actual | % Actual Change | % Standardized Change |
| Beijing | |||||
| <20/63 to 20/400 | 8.32 (6.99, 9.66) | 7.95 (7.21,8.68) | 6.05 (5.35, 6.74) | −27.3%* | −23.9%* |
| <20/400 | 1.25 (0.80, 1.70) | 1.15 (0.87, 1.42) | 0.66 (0.48, 0.84) | −47.2% | −42.6%* |
| Jiangsu | |||||
| <20/63 to 20/400 | 6.89 (6.03, 7.74) | 8.15 (7.34,8.96) | 9.94 (8.78, 11.1) | +44.3%* | +22.0% |
| <20/400 | 2.20 (1.59, 2.81) | 2.59 (2.10,3.08) | 1.27 (0.90, 1.64) | −42.3% | −51.0%* |
| Guangdong | |||||
| <20/63 to 20/400 | 18.2 (16.7, 19.6) | 19.8 (18.6, 20.9) | 15.3 (14.3, 16.2) | −15.9%* | −22.7%* |
| <20/400 | 2.68 (2.18, 3.18) | 2.79 (2.30, 3.29) | 1.76 (1.26, 2.25) | −34.3% | −36.9%* |
| Heilongjiang | |||||
| <20/63 to 20/400 | 7.23 (6.00, 8.47) | 7.95 (7.13,8.76) | 7.88 (6.99, 8.77) | +8.99% | −0.88% |
| <20/400 | 1.90 (1.44, 2.36) | 1.86 (1.46, 2.26) | 1.39 (1.14, 1.65) | −26.8% | −25.3% |
| Jiangxi | |||||
| <20/63 to 20/400 | 14.5 (13.2, 15.8) | 17.2 (16.1, 18.2) | 11.6 (10.5, 12.7) | −20.0%* | −32.6%* |
| <20/400 | 1.88 (1.67, 2.19) | 2.27 (1.82,2.71) | 1.23 (0.87, 1.60) | −34.6%* | −45.8%* |
| Hebei | |||||
| <20/63 to 20/400 | 7.94 (7.10, 8.77) | 8.89 (8.07,9.71) | 8.29 (7.22, 9.37) | +4.41% | −6.75% |
| <20/400 | 1.48 (1.09, 1.88) | 1.65 (1.26,2.04) | 0.70 (0.52, 0.88) | −52.7%* | −57.6%* |
| Chongqing | |||||
| <20/63 to 20/400 | 10.7 (9.62, 11.8) | 12.4 (11.5, 13.4) | 9.91 (8.07, 11.8) | −7.38% | −20.1% |
| <20/400 | 2.49 (1.97, 3.00) | 3.03 (2.53, 3.53) | 1.46 (1.06, 1.86) | −41.4%* | −51.8%* |
| Yunnan | |||||
| <20/63 to 20/400 | 15.8 (14.6, 17.1) | 17.2 (16.1, 18.2) | 14.7 (13.2, 16.2) | −6.96% | −14.5% |
| <20/400 | 5.40 (4.20, 6.60) | 6.61 (5.92, 7.31) | 5.35 (4.49, 6.20) | −0.93% | −19.1% |
| All study sites | |||||
| <20/63 to 20/400 | 11.1 (10.5, 11.7) | 12.4 (12.1, 12.8) | 10.4 (9.94, 10.9) | −6.31% | −16.1%* |
| <20/400 | 2.41 (2.18, 2.64) | 2.76 (2.60,2.93) | 1.71 (1.52, 1.90) | −29.0%* | −38.0%* |
Change in prevalence was calculated as a proportional percentage of the 2006 (actual) prevalence rate and as a proportional percentage of the 2006 prevalence rate after age and sex standardization to the 2014 population.
a
The change in prevalence was considered statistically significant at the P < .05 level, indicated by an asterisk (*), if 95% confidence intervals for the 2006 and 2014 prevalence rates did not overlap.
b
Prevalence in 2006 projected to an age- and sex-standardized 2014 population.