Table 7.

Descriptive statistics and 95% CIs for mean directionless errors calculated as the absolute value of semidigital (landmarking on paper but calculations by computer) minus fully digital (both landmarking and measurements done manually on the computer screen). The p values are calculated once by comparing the mean errors with zero and, if significant, then once more by comparing them with the absolute values of 1/100 of the means of gold standard tracing values. All measurements were significantly smaller than 2 (all p values < 0.0005). The number of samples per row is 101 (n = 101).

Measurement	Mean	SD	Min	Q1	Med	Q3	Max	95% CI		P 0	P g o l d/100
N-A-Pog	0.586	0.371	0.001	0.282	0.557	0.835	1.600	0.513	0.659	< 0.00000005	< 0.00000005
Facial angle	0.282	0.223	0.002	0.107	0.236	0.382	0.967	0.238	0.326	< 0.00000005	< 0.00000005
A-B plane	0.532	0.337	0.012	0.247	0.487	0.784	1.422	0.466	0.598	< 0.00000005	< 0.00000005
MP angle	0.338	0.239	0.002	0.140	0.321	0.472	1.160	0.291	0.386	< 0.00000005	0.00017
NSG	0.296	0.209	0.013	0.127	0.252	0.426	0.871	0.254	0.337	< 0.00000005	< 0.00000005
OP cant	0.526	0.397	0.021	0.206	0.401	0.770	1.729	0.447	0.604	< 0.00000005	< 0.00000005
Interincisal angle	1.014	0.774	0.023	0.332	0.810	1.512	3.439	0.861	1.167	< 0.00000005	0.0016988
L1 ^ OP	0.932	0.691	0.025	0.424	0.808	1.283	4.188	0.795	1.068	< 0.00000005	0.004
L1 ^ MP	0.855	0.658	0.046	0.320	0.704	1.293	3.829	0.725	0.985	< 0.00000005	0.748
U1 protrusion	0.724	0.399	0.006	0.438	0.704	1.012	1.683	0.645	0.803	< 0.00000005	< 0.00000005
SNA	0.417	0.301	0.005	0.164	0.390	0.612	1.290	0.357	0.476	< 0.00000005	< 0.00000005
SNB	0.325	0.237	0.001	0.130	0.276	0.531	1.039	0.279	0.372	< 0.00000005	< 0.00000005
ANB	0.297	0.185	0.018	0.139	0.275	0.435	0.767	0.261	0.334	< 0.00000005	< 0.00000005
OP-S-N	0.505	0.409	0.003	0.160	0.361	0.754	1.764	0.424	0.585	< 0.00000005	< 0.00000005
MP-S-N	0.382	0.264	0.021	0.173	0.337	0.519	1.358	0.330	0.434	< 0.00000005	0.230
U1-N-A	0.803	0.579	0.008	0.317	0.723	1.194	2.538	0.689	0.918	< 0.00000005	< 0.00000005
L1-N-B	0.833	0.683	0.010	0.327	0.674	1.186	3.705	0.698	0.968	< 0.00000005	< 0.00000005

Note: The reference values for comparisons for the second p value column are as follows: 0.055, 0.878, 0.064, 0.246, 1.100, 0.079, 1.263, 1.136, 0.834, 0.053, 0.796, 0.763, 0.034, 0.181, 0.351, 0.224, and 0.280, respectively, for N-A-Pog, facial angle, A-B plane, MP angle, NSG, the cant of OP, interincisal angle, L1 ^ OP, L1 ^ MP, U1 protrusion, SNA, SNB, ANB, OP-S-N, MP-S-N, U1-N-A, and L1-N-B.

Abbreviations: CI, confidence interval based on the t distribution; Max, maximum; Med, median; Min, minimum; OP, occlusal plane; Q1, first quartile; Q3, third quartile; SD, standard deviation.