Drill Hole

Protrusion Distance (mm)
Median (Q1, Q3)

Maximum
(mm)

Z-score*
(to 10-mm limit)

D1

1.6 (1.1, 2.1)

3.5

12.30

D2

2.2 (1.7, 2.5)

4.9

9.79

D3

2.2 (1.8, 2.8)

4.8

10.22

D4

2.3 (1.9, 2.7)

4.9

10.72

* Z-score indicates how many standard deviations the mean is from the 10-mm anatomical limit.