Table 1.

Demographics and material properties of lumbar spine motion segments^a from 85 donor cadaver spines. All data are mean ± SD.

Variable	Donors
	Women + Men (n = 251)	Women (n = 116)	Men (n = 135)
Age, y	53.9 ± 10.7	52.6 ± 11.8	55.0 ± 9.6
Weight, kg	95.2 ± 32.6	97.1 ± 36.9	93.6 ± 28.9
Height, cm	173.4 ± 9.5	167.5 ± 8.2	178.0 ± 7.6c
BMI	31.8 ± 11.8	34.9 ± 14.3	29.5 ± 8.95c
BMD,b g/cm2	0.818 ± 0.171	0.793 ± 0.155	0.838 ± 0.181c
Sup VB height, mm	26.0 ± 2.3	25.7 ± 2.5	26.1 ± 2.1
IVD height, mm	6.5 ± 1.5	5.9 ± 1.3	6.9 ± 1.5c

Abbreviations: BMI, body mass index; BMD, bone mineral density; IVD, intervertebral disc; Sup VB, superior vertebral body.

^aIncluded 251 motion segments from 85 spines (T12-S [n = 14], L3-S [n = 15], L2-L5 [n = 48], L3-L5 [n = 8]).

^bBMD of L4.

^cSignificant difference (P < .05) between male and female groups (ANOVA t test).