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. Author manuscript; available in PMC: 2019 Mar 2.
Published in final edited form as: Spine (Phila Pa 1976). 1992 Feb;17(2):200–205. doi: 10.1097/00007632-199202000-00014

Table 2.

Redigitizing Errors

Scriptel
 Altek
SD Mean SD Mean
Rx 0.56 12.7 0.13 13.5
Ay 0.32 3.6 0.06 4.7
Az 0.25 1.5 0.04 2.0
By 0.40 3.9 0.07 6.1
Bz 0.81 9.3 0.10 10.1
Cy 2.02 31.9 0.18 31.6
Cz 1.72 9.4 0.17 16.0

Note: Comparisons of the standard deviations and means obtained by the Scriptel and Altek digitizers. The results are based on five redigitizations of the normal radiographic pair at the L3–L4 level, using reference line RL1 for the computations.