Table 4

	IF	MP	SF
	Mean (SD)	Mean (SD)	Mean (SD)
A	3.27 (1.05)	2.98 (1.14)^A	3.74 (1.34)^A
B	3.46 (0.91)	3.51 (0.92)^B	4.4 (1.11)^B
C	3.42 (1.08)	3.27 (1.06)^B	4.08 (1.15)^B
P value	0.079	0.000^a	0.000^a

^aStatistically significant at level P ≤ 0.01 (independent samples Kruskal-Wallis test).
The uppercase superscript indicates statistical differences within column (Dunn-Bonferroni post hoc analysis).
IF = incisive foramen; MP = mid-level point; SF = stenson foramen; NPC = nasopalatine canal; SD = standard deviation.