Table 2.
Prevalence of myopia in the study population
| Anhui |
Shanghai |
Yunnan |
All |
P-value† |
|||||
|---|---|---|---|---|---|---|---|---|---|
|
Age (years)
|
Myopia, No. (%)*
|
Sample Size
|
Myopia, No. (%)*
|
Sample Size
|
Myopia, No. (%)*
|
Sample Size
|
Myopia, No. (%)
|
Sample Size
|
|
| 5-9 |
81 (10.8) |
750 |
130 (18.4) |
706 |
30 (4.9) |
607 |
241 (11.6) |
2063 |
<0.01 |
| 10-14 |
361 (36.0) |
1002 |
341 (45.7) |
747 |
309 (30.5) |
1012 |
1011 (36.6) |
2761 |
<0.01 |
| 15-19 |
822 (72.6) |
1133 |
637 (70.7) |
901 |
620 (63.9) |
971 |
2079 (69.2) |
3005 |
<0.01 |
| 20-24 |
423 (83.8) |
505 |
366 (83.4) |
439 |
446 (82.0) |
544 |
1235 (83.0) |
1488 |
0.72 |
| 25-29 |
112 (47.1) |
238 |
213 (73.2) |
291 |
108 (41.4) |
261 |
433 (54.8) |
790 |
<0.01 |
| 30-34 |
187 (24.1) |
777 |
184 (43.4) |
424 |
111 (15.9) |
698 |
482 (25.4) |
1899 |
<0.01 |
| 35-39 |
339 (22.2) |
1527 |
547 (48.5) |
1129 |
266 (18.6) |
1432 |
1152 (28.2) |
4088 |
<0.01 |
| 40-44 |
329 (22.3) |
1474 |
488 (43.5) |
1123 |
294 (19.4) |
1519 |
1111 (27.0) |
4116 |
<0.01 |
| 45-50 |
115 (20.7) |
557 |
269 (39.5) |
681 |
149 (23.0) |
649 |
533 (28.3) |
1887 |
<0.01 |
| All | 2769 (34.8) | 7963 | 3175 (49.3) | 6441 | 2333 (30.3) | 7693 | 8277 (37.5) | 22 097 | <0.01 |
*Myopia prevalence increased to over 80% in the 20-24 y of age, and then gradually decreased in all the three sampling areas.
†χ2 test of myopia prevalence of sample population among three provinces.