Table 4.

Correlation between Little’s Irregularity Index (LII) and root resorption

LII comparison	Mean root resorption (A)	Mean root resorption (B)	Differences in root resorption between the three LII groups (A – B)	P-value
Groups 1 and 2	LII <6 mm: mean root resorption =0.61 mm	LII >6 to <10 mm: mean root resorption =0.57 mm	0.04 mm	0.722
Groups 1 and 3	LII <6 mm: mean root resorption =0.61 mm	For LII >10 mm: mean root resorption =0.63 mm	−0.02 mm	0.854
Groups 2 and 3	For LII >6 to <10 mm: mean root resorption =0.57 mm	For LII >10 mm: mean root resorption =0.63 mm	−0.06 mm	0.660

Notes: The mean values for LII for all patients were divided into three groups: group 1, LII <6 mm; group 2, LII 6–10 mm; group 3, LII >10 mm. The mean resorptions for each of the three LII groups were compared by subtracting one group from the other (A – B). P-value <0.05.