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 0.000a 0.000a

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.