Prevalence of pterygium by age, race and gender
| Cases | Prevalence rate | P value for age for trend | P value for gender | P value for race | ||||||||
| Total (95% CI) | Adjusted† (95% CI) | Age groups | ||||||||||
| 40–49 | 50–59 | 60–69 | 70–79 | |||||||||
| Any pterygium (either eye) | ||||||||||||
| All (n=3790) | 248 | 6.5% | (5.7 to 7.3) | 6.1% | (5.4 to 6.9) | 2.4% | 6.0% | 11.4% | 10.6% | <0.001* | ||
| Han (n=2351) | 145 | 6.2% | (5.2 to 7.2) | 5.5% | (4.6 to 6.4) | 1.6% | 6.0% | 11.1% | 9.2% | <0.001* | 0.232 | |
| Manchu (n=1439) | 103 | 7.2% | (5.9 to 8.5) | 7.0% | (5.7 to 8.4) | 3.9% | 6.2% | 12.0% | 13.5% | <0.001* | ||
| Men (n=1518) | 118 | 7.8% | (6.5 to 9.1) | 6.9% | (5.6 to 8.2) | 2.9% | 6.5% | 12.2% | 15.0% | <0.001* | 0.012* | |
| Women (n=2272) | 130 | 5.7% | (4.7 to 6.7) | 5.4% | (4.4 to 6.3) | 2.2% | 5.7% | 10.7% | 7.0% | <0.001* | ||
| Bilateral pterygium | ||||||||||||
| All (n=3790) | 90 | 2.4% | (1.9 to 2.9) | 2.2% | (1.8 to 2.7) | 0.5% | 2.3% | 4.0% | 4.9% | <0.001* | ||
| Han (n=2351) | 56 | 2.4% | (1.8 to 3.0) | 2.1% | (1.5 to 2.7) | 0.1% | 3.0% | 4.0% | 3.6% | <0.001* | 0.970 | |
| Manchu (n=1439) | 34 | 2.4% | (1.6 to 3.2) | 2.4% | (1.6 to 3.2) | 1.1% | 1.5% | 4.2% | 7.9% | <0.001* | ||
| Men (n=1518) | 44 | 2.9% | (2.1 to 3.7) | 2.6% | (1.8 to 3.4) | 0.7% | 2.5% | 4.2% | 7.9% | <0.001* | 0.083 | |
| Women (n=2272) | 46 | 2.0% | (1.4 to 2.6) | 1.9% | (1.3 to 2.4) | 0.4% | 2.3% | 4.0% | 2.5% | <0.001* | ||
| Grade 1 pterygium | ||||||||||||
| All (n=3790) | 73 | 1.9% | (1.5 to 2.3) | 1.9% | (1.5 to 2.3) | 1.3% | 1.6% | 3.1% | 2.5% | 0.018* | ||
| Han (n=2351) | 42 | 1.8% | (1.3 to 2.3) | 1.6% | (1.1 to 2.1) | 0.9% | 1.7% | 2.8% | 2.1% | 0.081 | 0.424 | |
| Manchu (n=1439) | 31 | 2.2% | (1.4 to 3.0) | 2.2% | (1.4 to 2.9) | 1.8% | 1.5% | 3.6% | 3.4% | 0.173 | ||
| Men (n=1518) | 39 | 2.6% | (1.8 to 3.4) | 2.3% | (1.6 to 3.1) | 1.2% | 2.5% | 3.7% | 3.9% | 0.108 | 0.019* | |
| Women (n=2272) | 34 | 1.5% | (1.0 to 2.0) | 1.5% | (1.0 to 2.0) | 1.3% | 1.1% | 2.6% | 1.3% | 0.155 | ||
| Grade 2 pterygium | ||||||||||||
| All (n=3790) | 144 | 3.8% | (3.2 to 4.4) | 3.5% | (2.9 to 4.0) | 0.8% | 4.1% | 6.6% | 6.3% | <0.001* | ||
| Han (n=2351) | 86 | 3.7% | (2.9 to 4.5) | 3.2% | (2.5 to 3.9) | 0.4% | 3.9% | 6.6% | 6.2% | <0.001* | 0.560 | |
| Manchu (n=1439) | 58 | 4.0% | (3.0 to 5.0) | 3.8% | (2.8 to 4.8) | 1.4% | 4.3% | 6.5% | 6.7% | 0.002* | ||
| Men (n=1518) | 67 | 4.4% | (3.4 to 5.4) | 3.9% | (2.9 to 4.8) | 1.4% | 3.4% | 7.3% | 9.4% | <0.001* | 0.106 | |
| Women (n=2272) | 77 | 3.4% | (2.7 to 4.1) | 3.1% | (2.3 to 3.8) | 0.4% | 4.5% | 5.9% | 3.8% | <0.001* | ||
| Grade 3 pterygium | ||||||||||||
| All (n=3790) | 31 | 0.8% | (0.5 to 1.1) | 0.7% | (0.5 to 1.0) | 0.4% | 0.4% | 1.7% | 1.8% | <0.001* | ||
| Han (n=2351) | 17 | 0.7% | (0.4 to 1.0) | 0.7% | (0.3 to 1.0) | 0.3% | 0.4% | 1.7% | 1.0% | 0.012* | 0.407 | |
| Manchu (n=1439) | 14 | 1.0% | (0.5 to 1.5) | 1.0% | (0.5 to 1.6) | 0.7% | 0.3% | 1.9% | 3.4% | 0.010* | ||
| Men (n=1518) | 12 | 0.8% | (0.4 to 1.2) | 0.7% | (0.3 to 1.1) | 0.2% | 0.7% | 1.2% | 1.6% | 0.304 | 0.878 | |
| Women (n=2272) | 19 | 0.8% | (0.4 to 1.2) | 0.8% | (0.5 to 1.2) | 0.5% | 0.1% | 2.2% | 1.9% | <0.001* | ||
†Based on sixth China national population census on 2010,14 prevalence for all individuals was adjusted by age and gender, and prevalence for Han, Manchu, Men and Women was adjusted by age.
*p < 0.05