1 资料与方法
1.1 数据来源
1.2 研究设计
1.3 研究变量提取与疾病定义
1.4 统计学分析
2 结果
2.1 一般人口学特征
表1 研究队列的基线人口学特征Table 1 Baseline demographic characteristics of the study cohort |
| Characteristic | Total cohort (n=2 252 691) | Cases (n=2 650) | χ2 value | P value |
| Gender, n (%) | 71.99 | <0.001 | ||
| Male | 1 174 324 (52.13) | 1 600 (60.38) | ||
| Female | 1 078 367 (47.87) | 1 050 (39.62) | ||
| Residence, n (%) | 7.87 | 0.005 | ||
| Urban | 1 887 426 (83.78) | 2 274 (85.81) | ||
| Rural | 365 265 (16.22) | 376 (14.19) | ||
| Birth year, n (%) | ||||
| 2018 | 409 210 (18.17) | 332 (12.53) | ||
| 2019 | 434 083 (19.27) | 573 (21.62) | ||
| 2020 | 410 813 (18.24) | 690 (26.04) | ||
| 2021 | 358 774 (15.93) | 672 (25.36) | ||
| 2022 | 344 582 (15.30) | 327 (12.34) | ||
| 2023 | 295 229 (13.10) | 56 (2.11) |
Cases indicates the incident cases of intussusception. P values for birth year were not calculated because the differences in composition are influenced by varying follow-up durations (person-years) across different years, rendering a direct Chi-square test inappropriate. |
2.2 肠套叠的发病密度
表2 肠套叠发病密度的性别与城乡分布特征Table 2 Distribution of incidence density of intussusception by population characteristics |
| Characteristic | Cases | Person-years | Incidence density(/100 000 person-years) | IRR (95%CI) | P value |
| Total | 2 650 | 5 316 389.55 | 49.8 (47.9-51.7) | ||
| Gender | 1.40 (1.30-1.52) | <0.001 | |||
| Male | 1 600 | 2 770 401.07 | 57.8 (54.9-60.6) | ||
| Female | 1 050 | 2 545 988.47 | 41.2 (38.7-43.7) | ||
| Residence | 1.12 (1.00-1.25) | 0.046 | |||
| Urban | 2 274 | 4 487 101.09 | 50.7 (48.6-52.8) | ||
| Rural | 376 | 829 288.46 | 45.3 (40.8-49.9) |
Cases indicates the incident cases of intussusception. IRR, incidence rate ratio; CI, confidence interval. |
