Table 2.

Intra-rater-reproducibility of landmark definition assessed for 20 cases

Reference point	Coordinate	Mean difference [mm]	Standard deviation [mm]	Range [mm]
S	x	–0.012	0.091	–0.150; 0.260
S	y	0.004	0.114	–0.310; 0.160
N	x	0.026	0.119	–0.150; 0.310
N	y	0.118	0.189	–0.310; 0.430
A	x	–0.075	0.110	–0.290; 0.170
A	y	0.081	0.261	–0.310; 0.540

Differences were defined as measurement No1 minus measurement No2