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Table 2 The mean value of fraction of bone regeneration (FBR) of the experimental group (group B; FBR_B) increases from the 2nd to the 8th week compared to FBR of the control group (group A; FBR_A) (P = 0.009). More in detail, at the 2nd postoperatively week the FBR of group A was 14.88%, while the FBR of group B was 19.96%. Four weeks postoperatively, the FBR of group A was 16.73%, while the group’s B FBR was 39.13%. Finally, 8 weeks postoperatively the FBR of group A was 15.98%, while the FBR of group B was 42.13%

From: The effect of nano-hydroxyapatite/chitosan scaffolds on rat calvarial defects for bone regeneration

Group Week Mean Std. error 95% confidence  
Lower bound Upper bound P value
aFBR_A 2 14.88 3.45 7.96 21.80 0.009
4 16.73 3.62 9.47 23.98
8 15.98 3.62 8.72 23.23
bFBR_B 2 19.96 3.45 13.04 26.87
4 39.13 3.62 31.88 46.39
8 42.13 3.62 34.87 49.38
  1. aFBR_A = mean value of fraction of bone regeneration (%) for group A (control group)
  2. bFBR_B = mean value of fraction of bone regeneration (%) for group B (experimental group)