Table 3.

Mean changes in bone density of the test and control sites at 6 and 12 months post-surgery

	Test (n = 15)	Control (n = 15)	p value
Mean change in bone density in subtraction at 6 months (compared to baseline)a	84.7% [0.79–0.91] ± 0.107	83.4% [0.76–0.91] ± 0.129	0.746
Mean change in bone density in subtraction at 12 months (compared to baseline)b	88.9% [0.85–0.93] ± 0.078	82.5% [0.74–0.91] ± 0.148	0.156
Mean change in bone density in subtraction at 12 months (compared to 6 months)c	4.9%d,e [0.02–0.08] ± 0.058	− 0.8%d [− 0.02 to 0.03] ± 0.04	0.011
p value (mean change in bone density between 12 months and 6 months within the same group)	0.008	0.585

^aThe results show the means with 95% CI [in brackets] and ± SD of subtraction radiographic outcomes 6 months post-operatively compared to baseline

^bThe results show the means with 95% CI [in brackets] and ± SD of subtraction radiographic outcomes 12 months post-operatively compared to baseline

^cThe results show the means with 95% CI [in brackets] and ± SD of subtraction radiographic outcomes 12 months post-operatively compared to subtraction radiographic outcomes at 6 months

^dShows significant differences (p < 0.05) between values of the mean changes in subtraction radiographic outcomes between 12 and 6 months following surgery between test and control

^eShows significant differences (p < 0.05) between values of the mean changes in subtraction radiographic outcomes between 12 and 6 months following surgery within the same group