Table 2.

Bland-Altman test values for precision measurements. All measured differences were less than the measured accuracy of the systems.

	Output Bland-Altman
	Mean	S.D.	95 % confidence		Mean−2S.D.	Mean+2S.D.
Day 1 vs Day 2
EM_LD	−0.009	0.065	−0.053	0.034	−0.139	0.121
EM CP	−0.158	0.192	−0.287	−0.029	−0.542	0.226
EMCT LD	0.008	0.071	−0.040	0.055	−0.135	0.150
EMCT CP	−0.133	0.170	−0.247	−0.018	−0.473	0.208
EM ROT	−0.031	0.018	−0.060	−0.002	−0.068	0.005
OE LD	0.003	0.026	−0.015	0.02	−0.049	0.054
OE CP	0.003	0.037	−0.022	0.028	−0.072	0.078
OECT LD	−0.032	0.102	−0.100	0.037	−0.236	0.172
OECT CP	−0.008	0.101	−0.076	0.059	−0.210	0.193
OE ROT	−0.039	0.063	−0.139	0.061	−0.164	0.087
System vs System+CT
EM LD	0.001	0.023	−0.009	0.011	−0.046	0.048
EM CP	−0.088	0.067	−0.117	−0.058	−0.222	0.047
OE LD	−0.011	0.078	−0.045	0.024	−0.167	0.145
OE CP	−0.234	0.134	−0.294	−0.175	−0.503	0.034
EM vs OE
LD	0.024	0.059	−0.002	0.050	−0.095	0.143
CP	0.274	0.232	0.171	0.377	−0.190	0.738
CT LD	0.012	0.102	−0.033	0.057	−0.192	0.216
CT CP	0.127	0.188	0.044	0.211	−0.249	0.504
Rotation	−0.066	0.057	−0.114	−0.018	−0.181	0.048