Table 2. Comparison of mean and standard deviation between 3 modalities of measurement made of 15 variables.

Axis	Variable	M1	M2	M3	Significance (P ≤ 0.05)
Z-axis	P1	67.33 ± 2.23	68.33 ± 2.34	68.76 ± 2.95	M1 vs M3 (0.04)
	P2	101.44 ± 1.72	101.86 ± 2.84	102.99 ± 1.48	M1 vs M3 (0.02)
	P3	51.64 ± 2.21	51.59 ± 1.41	52.23 ± 2.90
	P4	114.92 ± 4.30	105.75 ± 3.81	115.26 ± 4.04	M1 vs M2 (0.0001); M2 vs M3 (0.0001)
	P5	114.39 ± 5.88	105.44 ± 4.13	114.11 ± 6.12	M1 vs M2 (0.005); M2 vs M3 (0.005)
	P6	84.83 ± 2.27	73.31 ± 3.72	84.45 ± 2.45	M1 vs M2 (0.0001); M2 vs M3 (0.0001)
	P7	84.55 ± 2.20	73.87 ± 5.28	85.00 ± 2. 15	M1 vs M2 (0.003); M2 vs M3 (0.001)
X-axis	P8	54.01 ± 3.25	55.56 ± 3.40	53.75 ± 3.49	M1 vs M2 (0.003); M2 vs M3 (0.001)
	P9	91.09 ± 5.60	96.82 ± 6.21	91.81 ± 5.80	M1 vs M2 (0.0001); M2 vs M3 (0.0001)
	P10	84.58 ± 7.29	90.25 ± 7.93	84.58 ± 6.75	M1 vs M2 (0.0001); M2 vs M3 (0.0001)
Y-axis	P11	58.93 ± 4.52	61.09 ± 3.37	59.46 ± 4.59	M1 vs M2 (0.03)
	P12	57.62 ± 5.31	59.83 ± 4.46	57.63 ± 5.48	M1 vs M2 (0.004); M2 vs M3 (0.01)
	P13	104.15 ± 3.70	103.02 ± 4.77	104.14 ± 3.58
	P14	58.86 ± 4.68	58.15 ± 5.91	59.05 ± 5.49
	P15	45.91 ± 3.17	45.71 ± 3.84	46.12 ± 3.35

M1, direct skill measurements; M2, digital cephalogram; M3, spiral CT