Table 5.

Descriptive statistics and 95% CIs for mean directionless errors calculated as the absolute value of the gold standard (all on paper) minus semidigital (landmarking on paper but measurements using the computer). 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	0.587	0.378	0.000	0.269	0.540	0.835	1.661	0.512	0.661	< 0.00000005	< 0.00000005
Facial angle	0.477	0.344	0.009	0.207	0.432	0.711	1.712	0.409	0.545	< 0.00000005	< 0.00000005
A-B plane	0.531	0.337	0.024	0.222	0.479	0.770	1.395	0.465	0.598	< 0.00000005	< 0.00000005
MP angle	0.367	0.260	0.008	0.171	0.333	0.518	1.388	0.316	0.419	< 0.00000005	0.0000079
NSG	0.604	0.373	0.007	0.308	0.557	0.867	1.742	0.530	0.677	< 0.00000005	< 0.00000005
OP cant	0.524	0.396	0.012	0.194	0.407	0.789	1.743	0.446	0.602	< 0.00000005	< 0.00000005
Interincisal angle	1.056	0.832	0.003	0.390	0.912	1.494	3.639	0.892	1.220	<0.00000005	0.014
L1 ^ OP	0.968	0.739	0.010	0.374	0.807	1.418	3.823	0.823	1.114	< 0.00000005	0.025
L1 ^ MP	0.954	0.755	0.022	0.344	0.787	1.486	3.693	0.805	1.103	< 0.00000005	0.111
U1 protrusion	0.728	0.390	0.025	0.424	0.693	0.996	1.679	0.651	0.805	< 0.00000005	< 0.00000005
SNA	0.537	0.385	0.001	0.237	0.478	0.801	1.653	0.461	0.613	< 0.00000005	< 0.00000005
SNB	0.432	0.324	0.005	0.160	0.376	0.681	1.655	0.368	0.496	< 0.00000005	< 0.00000005
ANB	0.292	0.189	0.005	0.124	0.268	0.432	0.830	0.255	0.330	< 0.00000005	< 0.00000005
OP-S-N	0.537	0.414	0.000	0.189	0.430	0.803	1.797	0.455	0.618	< 0.00000005	<0.00000005
MP-S-N	0.422	0.299	0.001	0.181	0.405	0.588	1.481	0.363	0.481	< 0.00000005	0.019
U1-N-A	0.805	0.584	0.044	0.324	0.683	1.135	2.699	0.690	0.921	< 0.00000005	< 0.00000005
L1-N-B	0.844	0.708	0.001	0.311	0.682	1.206	3.972	0.705	0.984	< 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.