Table 5. Comparisons of radiological evaluation of bone formation over time intervals by Wilcoxon matched pairs test.

Elapsed time (wk)	Mean	SD	Median	Mean diff.	% of change	Z-value	P-value
1	0.00	0.00	0.00
4	1.90	0.31	2.00	−1.90	100.00	3.9199	0.0001*
4	1.90	0.31	2.00
8	3.10	0.31	3.00	−1.20	−63.16	3.9199	0.0001*
8	3.10	0.31	3.00
12	3.90	0.31	4.00	−0.80	−25.81	3.5162	0.0004*
12	3.90	0.31	4.00
24	3.95	0.22	4.00	−0.05	−1.28	3.9199	0.0001*

(SD: standard deviation, diff.: difference)

^*Statistically significant difference (P<0.05).