Score Group 1
(n = 74)
Group 2
(n = 76)
Group 3
(n = 72)
Coronal third 1 64a 68a 64a
2 8a 6a 6a
3 4a 2a 1a
4 0a 0a 0a
Middle third 1 50a 48a 44a
2 12a 18a 14a
3 10a 8a 10a
4 2a 2a 4a
Apical third 1 4a 20b 16b
2 24a 38b 36b
3 36a 14b 16b
4 10a 4a 4a

Note: Different superscript letters indicate statistical significant differences (P < 0.05) among groups using the Kruskal-Wallis test and Bonferroni multiple range test for multiple group comparisons.