Table 6. Average variance for intraobserver trials for different scan types for the entire landmark protocol.

Researcher	Landmark Set	NextEngine	Breuckmann	Minolta	CT	Total average variance by Landmark set
R1 (LX)	Full	0.019	0.031	0.026	0.026	0.034
	Reduced	0.026	0.034	0.030	0.025	0.042
	Semilandmark	0.017	0.024	0.038	0.026	0.038
R2 (MX)	Full	0.040	0.035	0.030	0.029	0.040
	Reduced	0.039	0.032	0.035	0.025	0.038
	Semilandmark	0.057	0.050	0.044	0.047	0.055
R3 (LX)	Full	0.015	0.051	0.064	0.043	0.052
	Reduced	0.013	0.028	0.033	0.027	0.034
	Semilandmark	0.053	0.101	0.110	0.077	0.091
R4 (MX)	Full	0.019	0.015	0.028	0.019	0.025
	Reduced	0.015	0.016	0.023	0.017	0.021
	Semilandmark	0.026	0.026	0.047	0.030	0.041
R5 (HX)	Full	0.019	0.032	0.023	0.021	0.037
	Reduced	0.015	0.019	0.016	0.014	0.020
	Semilandmark	0.030	0.053	0.039	0.033	0.061
R6 (HX)	Full	0.018	0.019	0.019	0.017	0.022
	Reduced	0.015	0.016	0.019	0.014	0.022
	Semilandmark	0.034	0.040	0.036	0.041	0.041
R7 (MX)	Full	0.028	0.021	0.025	0.042	0.052
	Reduced	0.021	0.020	0.023	0.041	0.040
	Semilandmark	0.043	0.027	0.037	0.047	0.061
R8 (HX)	Full	0.040	0.031	0.025	0.030	0.034
	Reduced	0.043	0.034	0.023	0.028	0.035
	Semilandmark	0.075	0.066	0.051	0.058	0.066
R9 (T)	Full	0.026	0.024	0.033	0.043	0.038
	Reduced	0.023	0.020	0.027	0.036	0.037
	Semilandmark	0.038	0.046	0.050	0.068	0.057
Total average variance by scanner for all users and landmark sets	Full	0.026	0.029	0.031	0.030	0.0288
	Reduced	0.024	0.026	0.025	0.025	0.0252
	Semilandmark	0.041	0.048	0.05	0.48	0.0468