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Table 7 Comparison of mean RID change according to Pederson’s difficulty index (DI)

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

DI Assessment
RID6W_RID0 RID6M_RID6W RID6M_RID0
5 (n = 5) − 3.20 ± 1.64a − 2.63 ± 1.44b − 5.83 ± 1.68b
6 (n = 11) − 2.56 ± 2.11a − 2.91 ± 2.24b − 5.47 ± 2.43b
7 (n = 10) − 2.07 ± 1.09a − 4.08 ± 2.45b − 6.15 ± 2.21b
8 (n = 8) − 5.37 ± 2.80a − 2.86 ± 1.86b − 8.22 ± 1.63b
p value 0.010 0.488 0.053
  1. Abbreviations: RID6W_RID0 difference between the radiographic infrabony defect recorded at 6 months and at baseline, RID6M_RID6W difference between the radiographic infrabony defect recorded at 6 months and at 6 weeks, RID6M_RID0 difference between the radiographic infrabony defect recorded at 6 months and at baseline
  2. a)Statistically significant decrease in mean RID6W compared with baseline (RID0) according to Pederson’s difficulty index (DI) (p < 0.05) by one-way ANOVA
  3. b)No statistically significant decrease in mean RID change according to DI (p > 0.05) by one-way ANOVA