| Category | Subcategory or input parameter | Description | Outcomes | Articles |
| Features | Functionality or performance inspection | Device condition | | [50] | [32] | [60] | Age | Device age | | [42, 45, 47, 52] | [12, 44] | [32] | [37] | [20] | Criticality | Device criticality | | [45, 48, 49] | Type of equipment | Device name | | [44] | [32] | Class | Device classes | | [12] | [47] | Manufacturer | Device supplier | | [32] |
| Function | Clinical function or intended function | Device function | | [12, 42] | | [44, 45, 47–49] | | [37] | | [38] |
| Performance | Error codes | Error on device | | [50] | Failures and frequency | Occurrence of failures | | [50] | | [37] | | [12, 55] | | [48, 49] | Root cause of failures | Root cause of failures | | [55] | Useful life ratio | The ratio between the age and expected life | | [48, 49] | Service status of every failure mode | Status display on the device | | [50] | Temperature error | Error on temperature | | [29] | Operation and maintenance | Action taken/Repair notes | Tasks during repair work | | [50] | | [55] | Time to repair (downtime) | Time is taken during repair | | [50] | | [12, 42, 55] | | [47–49] | | [60] | Commission time | Time is taken for commission work | | [55] | Missed maintenance | Maintenance not to schedule | | [48, 49] | Parts or part usage | Spare parts inventory | | [29] | | [42] | | [35, 36] | Maintenance interval | Frequency of maintenance | | [46] | Maintenance requirement or complexity | Maintenance activity based on device type | | [31, 32] | | [2] | | [34–36] | | [48] | | [52] | Calibration | Calibration work | | [31] |
| Service availability | Availability of support/alternative devices | Availability of backup device or outsource services | | [2, 29] | | [32, 34] | | [52] | Impact of operation | Operational impact | | [29] | Incident history | Incident record | | [54] | No. of bed | Total bed | Management system | [55] | Distance to nearest hospital | Measured distance | Management system | [55] | Location | Device location | | [31, 35, 36], | Management system | [60] |
| Cost | Maintenance cost | Cost for spare parts and maintenance | | [12, 42] | Recall and hazards | Recall and hazards | Product recall and hazards | | [44, 45, 47, 52] | | [12] | Risk and safety | Risk and safety are associated with devices | | [12] | | [45, 47–49] | | [37] | | [38] | Detectability | Ability to detect failures | | [37] |
| Utilization | Staff preferences | Staff preferences | | [42] | Utilization coefficient/rate | Average total hours device is used | | [29] | | [12] | | [45, 47–49, 52] | | [37] |
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