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Device categorization for Kaplan-Meier-Method. Depending on the device function each implanted system is categorized at each time step
| Category | |
|---|---|
| A | Device in service, no complication reported. |
| B | Device removed from service for reasons not |
| related to the device functioning. | |
| C | Device with malfunction confirmed. |
| D | Patient died, death unrelated to the |
| functioning of the device. | |
| L | Device is lost to follow-up. No complication |
| or malfunction recorded. |
