(b).
| CEAP class [%] | |||
| 2 | 3 | 4 | 5 |
| 48.9 | 36.2 | 10.6 | 4.3 |
|
| |||
| Venous insufficiency operation [%] | |||
| Hypertension | Coronary heart disease | Diabetes | Heart attack |
| 44.7 | 6.4 | 8.5 | 4.3 |
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