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. 2019 Apr 4;20(4):45–50. doi: 10.1002/acm2.12557

Table 1.

Random and systematic errors for initial patient positioning, either with or without tattoos

Data in mm	Tattoo group				No‐tattoo group
Data in mm	Sup/inf	Ant/post	Left/right	3D	Sup/inf	Ant/post	Left/right	3D
Mean (μ)	−3.0	−4.3	−1.0	8.9^a	−5.0	0.1	0.4	20.0^a
Std dev (Σ)	4.2^a	3.5	3.8	3.4^a	20.8^a	9.2	3.3	14.1^a
Std dev (σ)	1.5^a	1.8	1.2	1.9^a	5.8^a	2.9	1.1	5.5^a

^a

Indicates statistically significant difference between the two patient groups.