Table 5.

Descriptive statistics for interradicular changes, classified into groups with a root proximity (periodontally high-risk dentition - interradicular bone quantity at T0 ≤ 0.8 mm) or with a periodontally normal dentition (interradicular bone volume at T0 >  0.8 mm) with Wilcoxon signed rank test for statistical analysis

Distance		n	Min.	Max.	Mean	SD	Wilcoxon test (≤ 0.8 mm vs. >  0.8 mm)
≤ 0.8 mm	T1–T0	124	−0.45	2.49	0.60	0.54	Z	−8.071
>  0.8 mm	T1–T0	596	−3.02	2.60	0.02	0.75	A. significance (two-sided)	<  0.001

SD standard deviation