This reports the Minimum Inter-Frame Delay Variation observed during a completed delay-measurement test, in microseconds, the best-case (smallest) frame-to-frame delay difference seen, rounding out the min/max/avg trio for this Y.1731 IFDV metric. An admin uses this alongside the maximum IFDV to see the full range of frame-to-frame delay behavior, since a wide min-to-max spread indicates inconsistent packet spacing even if the average IFDV appears moderate. For example, a minimum IFDV near zero next to a much larger maximum IFDV would tell the admin the path is capable of smooth frame delivery but doesn't sustain it consistently.