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From HTMcommunityDB.org

AEHF (average exposure to hidden failures)
...is the average fraction (or percentage) of the interval between Safety Verification (SV) tests during which the patient could be exposed to hidden failures. It is equal to 0.5 times the ratio of the SV testing interval to the Mean Time Between Failures (MTBF) of the device's hidden failure(s) and is a reasonable measure of patient safety with respect to those hidden failure(s). Smaller is better.

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