Table 1.

Bone volume and bone mass density of bone graft and empty chambers

Variable	Day 7	Day 21	Day 36	Day 70
Bone volume (mm3)
Bone graft	1436.0 ± 185.3	1036.8 ± 246.0†	531.7 ± 77.9*,‡	50.8*,‡,‖
Empty	135.0 ± 129.4*	195.2 ± 178.0‡	2.9 ± 2.8§	1.6
Bone density (mg/cm3)
Bone graft	628.0 ± 6.1	646.2 ± 17.1	667.7 ± 42.3	708.1
Empty	165.3 ± 65.4	212.7 ± 6.5	116.4 ± 45.0	177.2

Values are expressed as mean ± standard error of the mean; * p < 0.0001, ^†p < 0.01, as compared to bone graft at Day 7; ^‡p < 0.001, as compared to bone graft at Day 21; ^§p < 0.0001, ‖p < 0.01, as compared to bone graft at Day 36.