. 2014 Jul 1;5(2):e4. doi: 10.5037/jomr.2014.5204

Table 2.

Number of specimens registered for each score in the different root canal thirds in the evaluation of residual smear layer

	Score	Group 1 (n = 74)	Group 2 (n = 76)	Group 3 (n = 72)
Coronal third	1	60^a	58^a	58^a
	2	6^a	6^a	8^a
	3	4^a	10^a	2^a
	4	4^a	2^a	4^a

Middle third	1	52^a	48^a	48^a
	2	8^a	14^a	8^a
	3	6^a	8^a	12^a
	4	8^a	6^a	4^a

Apical third	1	8^a	30^b	30^b
	2	42^a	40^a	36^a
	3	20^a	4^b	4^b
	4	4^a	2^a	2^a

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.