Table III.
Incidence of AS (per 100,000 person-years) by different ethnic groups and cities
| Subgroup | Characteristic at baseline | Incidence rate per 100,000 person-years (95% CI) | P-value |
|---|---|---|---|
| Nationality | Bourau | 2.30 (CI: 1.15–3.45) | > 0.05* |
| Han nationality | 3.12 (CI: 0.90–5.34) | > 0.05* | |
| Other ethnic minorities | 3.14 (CI: 1.39–4.89) | > 0.05* | |
| City | Liuzhou | 4.87 (CI: 2.98–6.76) | > 0.05** |
| Guilin | 3.71 (CI: 2.03–5.39) | > 0.05** | |
| Hechi | 3.66 (CI: 1.81–5.51) | > 0.05** | |
| Laibin | 3.61 (CI: 2.23–4.99) | – | |
| Nanning | 3.41 (CI: 1.82–5.00) | – | |
| Guigang | 3.11 (CI: 2.30–3.92) | – | |
| Hezhou | 3.06 CI 1.04 - 5.08 | ------- | |
| Qinzhou | 2.91 (CI: 1.11–4.71) | – | |
| Wuzhou | 2.68 (CI: 1.50–3.86) | – | |
| Fangchenggang | 2.59 (CI: 1.41–3.77) | – | |
| Beise | 2.54 (CI: 1.40–3.68) | – | |
| Baihai | 2.30 (CI: 1.00–3.60) | < 0.05*** | |
| Yulin | 2.18 (CI: 0.72–3.64) | < 0.05*** | |
| Chongzou | 1.49 (CI: 0.50–2.48) | < 0.05*** |
*
It indicates that there is no significant difference in the 8-year average incidence rate (per 100,000 person-years) between the ethnic groups (p > 0.05).
**
It indicates that the 8-year mean incidence rate (per 100,000 person-years) of the three cities with the highest incidence was not significantly different (p > 0.05).
***
It indicates that the 8-year average incidence rate (per 100,000 person-years) was significantly different, when the three cities with the lowest incidence rate were compared with Liuzhou City (p < 0.05).