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Fundus screening of patients in two groups with different diabetes course.
| Course of diabetes | Control group | Observation group | χ2 value | p value |
|---|---|---|---|---|
| Course ⩽1 year | 236 (20.6%) | 1046 (77.3%) | 797.534 | <0.001 |
| 1 <course ⩽5 years | 108 (31.0%) | 312 (82.5%) | 197.124 | <0.001 |
| Course >5 years | 337 (37.1%) | 786 (86.9%) | 475.609 | <0.001 |
