Table 3.

Lumbar and coccygeal vertebra morphology of young and old mice

Age-Level	BV/TV, %	Tb.Th, μm	Tb.N, mm−1	Conn.D, mm−3	SMI	vBMD, mg HA/mm3	Cort.Th, μm
Lumbar
Young	21 ± 3	56 ± 3	5.2 ± 0.5	154 ± 32	1.6 ± 0.5	205 ± 23	98 ± 4
Old	17 ± 5*	57 ± 0.06	4.6 ± 0.7*	105 ± 50*	1.7 ± 0.6	171 ± 44*	93 ± 11
Coccygeal
Young	25 ± 3†	83 ± 5†	3.5 ± 0.2†	41 ± 8†	1.1 ± 0.3†	229 ± 35	162 ± 11†
Old	38 ± 5*†	106 ± 12*†	3.9 ± 0.3*†	42 ± 20†	0.04 ± 0.7*†	365 ± 49*†	213 ± 31*†

Values are means ± SD. BV/TV, bone volume/tissue volume; Tb.Th, trabecular thickness; Tb.N, trabecular number; Conn.D, connectivity density; SMI, structure model index; vBMD, volumetric bone mineral density; HA, hydroxyapatite; Cort.Th, cortical thickness.

^*Young vs. old of same vertebral level,

^†lumbar vs. coccygeal of same age: P < 0.05.