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Table 6 Descriptive data for mean RID0 (baseline) according to the difficulty index (DI)

From: Spontaneous bone regeneration after surgical extraction of a horizontally impacted mandibular third molar: a retrospective panoramic radiograph analysis

DI N Minimum Maximum Mean SD
5 5 6.38 9.50 7.78 1.33
6 11 5.24 12.49 9.17 2.15
7 8 5.58 13.51 9.86 2.70
8 5 8.12 12.70 10.91 1.47