Table 3. Comparison of abnormal IAD prevalence rates of the general population among three ethnic groups (n, %).
| Age/years | Han (n = 642) | Total | Uygur (n = 366) | Total | Kazakh (n = 595) | Total | |||
|---|---|---|---|---|---|---|---|---|---|
| Male | Female | Male | Female | Male | Female | ||||
| 35–44 y | 94 | 72 | 166 | 34 | 50 | 84 | 94 | 95 | 189 |
| (10.3%) | (8.0%) | (9.2%) | (13.0%) | (11.7%) | (12.2%) | (13.0%) | (11.3%) | (12.1%) | |
| 45–54 y | 73 | 83 | 156 | 59 | 59 | 118 | 82 | 91 | 173 |
| (12.1%) | (12.6%) | (12.4%) | (18.0%) | (13.9%) | (15.7%) | (17.8%) | (17.4%) | 17.6% | |
| 55–64 y | 47 | 88 | 135 | 36 | 54 | 90 | 63 | 73 | 136 |
| (11.9%) | (15.4%) | (13.9%) | (12.9%) | (8.1%) | (15.5%) | (20.5%) | (20.6%) | (16.3%) | |
| 65–74 y | 76 | 72 | 148 | 32 | 28 | 60 | 43 | 34 | 77 |
| (18.8%) | (13.0%) | (16.7%) | (16.8%) | (17.8%) | (17.3%) | (22.1%) | (21.5%) | (21.8%) | |
| more than 75y | 19 | 18 | 37 | 6 | 8 | 14 | 11 | 9 | 20 |
| (14.4%) | (20.7%) | (16.9%) | (11.1%) | (22.9%) | (15.7%) | (23.9%) | (31.0%) | (26.7%) | |
| Total | 309 | 333 | 642 | 167 | 199 | 366 | 293 | 302 | 595 |
| (12.6%) | (12.3%) | (12.5%) | (15.0%) | (14.8%) | (14.9%) | (16.9%) | (15.9%) | (16.4%) | |
| Standard prevalence | 309 | 333 | 642 | 167 | 199 | 366 | 293 | 302 | 595 |
| (11.9%) | (11.6%) | (11.8%) | (14.6%) | (14.3%) | (14.3%) | (16.7%) | (16.2%) | (15.7%) | |
The incidence of abnormal IAD was higher for the Kazakh ethnic group than for the Uygur and Han ethnic groups; there were differences between the three groups (χ2 = 70.35, P < 0.01). A significant difference was observed in the prevalence of IAD among different age groups (χ2 = 72.45, P < 0.01).