According to A23.3-14 (2014), Annex D (informative, non-mandatory) 5% fractile (a statistical term meaning 90% confidence that there is a 95% probability of the actual strength exceeding the nominal strength) is used. The design of structural anchors shall be based on computations using the 5% fractile of test results for:

Steel strength of anchor in tension;

Concrete breakout resistance of anchor in tension;

Pullout resistance of cast-in, post-installed expansion or undercut anchor in tension;

Concrete side-face blowout strength of headed anchor in tension;

Bond strength of adhesive anchor in tension;

Steel strength of anchor in shear;

Concrete breakout strength of anchor in shear; and

Concrete pryout resistance of anchor in shear.

Wish that helps.