Table 5.

Comparison between factors proposed in MS 2058:2018 and included studies.

Replacement factor	Included studies factor
Asset condition	Failure detectability
Asset status	Performance
Asset usage	Mission criticality; operational impact; utilisation
Frequency of breakdowns	No. of corrective maintenance, frequency of failures, rate of failures
Asset age	Device age
Obsolescence	Support availability; technology age; vendor support
Safety alert	Risk; failure consequences; recalls and hazard alerts
Maintenance cost	Cost of corrective maintenance
Availability of back up equipment	Alternative availability
User recommendation	Clinical acceptability