Table 4. Mean differences, SD, SE and paired t-test for comparison between conventional and digital tracing.

Measurements	Conventional tracing	Digital tracing	Difference			P-value
	(mean ± SD)	(mean ± SD)	Mean	SD	SE
Angular (°)
SNA	78.3 ± 3.3	79.3 ± 3.6	−1.0	1.4	0.3	0.0001***
SNB	76.2 ± 3.6	77.4 ± 3.6	−1.2	1.2	0.2	0.0001***
ANB	2.1 ± 3.4	1.9 ± 3.2	0.2	1.4	0.2	0.5
Angle of convexity	4.1 ± 6.0	4.5 ± 6.3	−0.4	1.3	0.2	0.09
SN-MP	41.8 ± 6.5	42.4 ± 6.3	−0.6	1.0	0.2	0.002**
SN-PP	8.3 ± 3.9	7.4 ± 3.8	0.9	0.9	0.2	0.0001***
PP-MP	34.6 ± 6.6	35.7 ± 6.5	−1.1	1.3	0.2	0.0001***
Gonial angle	131.6 ± 6.3	132.5 ± 7.0	−0.9	1.5	0.3	0.003**
1/-SN	103.9 ± 7.4	104.5 ± 7.0	−0.6	1.1	0.2	0.006**
/1-MP	84.7 ± 7.8	84.1 ± 7.9	0.6	1.1	0.2	0.005**
Linear (mm)
Anterior cranial base (N-S)	70.3 ± 4.3	70.1 ± 4.5	0.2	1.4	0.2	0.3
Mandibular length (Go-Gn)	77.7 ± 4.5	80.0 ± 4.8	−2.3	1.7	0.3	0.0001***
Maxillary length (ANS-PNS)	50.9 ± 3.6	49.8 ± 4.0	1.1	2.2	0.4	0.01*
Co-ANS	87.9 ± 4.8	85.0 ± 4.7	2.9	2.5	0.5	0.0001***
Co-Gn	118.8 ± 6.8	116.5 ± 7.3	2.3	1.9	0.4	0.0001***
LAFH (ANS-Me)	74.1 ± 7.5	74.0 ± 7.1	0.1	1.5	0.3	0.6

ANS, anterior nasal spine; Co, condylion; Gn, gnathion; Go, gonion; LAFH, lower anterior facial height; Me, menton; MP, mandibular plane; N, nasion; PNS, posterior nasal spine; PP, palatal plane; S, sella; SD, standard deviation; SE, standard error

* p < 0.05, ** p < 0.01, *** p < 0.001