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Table 4 Correlation between Little’s Irregularity Index (LII) and root resorption

From: A randomized trial on the effects of root resorption after orthodontic treatment using pulsating force

  Mean EARR Mean Ratio LII
For all patients and mandibular site
 Mean EARR 1 0.95692 0.30198
  <.0001 0.1423
 Mean Ratio 0.95692 1 0.36045
<.0001   0.0767
 LII 0.30198 0.36045 1
0.1423 0.0767  
For all patients and maxillary site
 Mean EARR 1 0.95308 0.2836
  <.0001 0.1897
 Mean Ratio 0.95308 1 0.33696
<.0001   0.1159
 LII 0.2836 0.33696 1
0.1897 0.1159