Table 3.

Proportional and ultimate loads and stresses with Young’s moduli of lumbar vertebrae L1–L2 correlation with age and BMD by distinguishing the sexes

Compressive loads and stresses		L1–L2
		Male (n = 16)				Female (n = 38)				Total (n = 54)
		Mean	rage	rBMD	rTscore	Mean	rage	rBMD	rTscore	Mean	rage	rBMD	rTscore
Proportional load, Fp	N	3212	−0.60	0.83	0.76	1582	−0.43	0.38	0.38	2065	−0.55	0.69	0.51
Ultimate load, Fu	N	4636	−0.66	0.90	0.75	2509	−0.52	0.47	0.40	3139	−0.61	0.75	0.52
Proportional size-corrected load, Fp/V	N/mm3	0.106	−0.61	0.84	0.81	0.082	−0.37	0.41	0.45	0.089	−0.46	0.56	0.57
Ultimate size-corrected load, Fu/V	N/mm3	0.153	−0.67	0.91	0.82	0.128	−0.44	0.48	0.46	0.135	−0.52	0.60	0.58
Superior proportional stress, σp,sup	MPa	2.09	−0.61	0.84	0.77	1.31	−0.50	0.41	0.40	1.54	−0.58	0.64	0.54
Central proportional stress, σp, centr	MPa	2.58	−0.62	0.85	0.78	1.68	−0.42	0.42	0.42	1.95	−0.53	0.64	0.55
Inferior proportional stress σp,inf	MPa	2.09	−0.60	0.84	0.77	1.25	−0.47	0.41	0.41	1.50	−0.56	0.65	0.55
Superior ultimate stress, σu,sup	MPa	3.00	−0.68	0.91	0.78	2.07	−0.59	0.48	0.41	2.35	−0.65	0.69	0.55
Central ultimate stress, σu, centr	MPa	3.71	−0.69	0.91	0.79	2.66	−0.50	0.50	0.43	2.97	−0.59	0.69	0.56
Inferior ultimate stress, σu,inf	MPa	3.00	−0.66	0.91	0.78	1.97	−0.55	0.49	0.43	2.27	−0.62	0.71	0.57
Young’s modulus, E	MPa	95.6	−0.55	0.79	0.71	67.4	−0.52	0.36	0.32	75.8	−0.56	0.57	0.48
Vertebral proportional stiffness, Kp	N/mm	4888	−0.38	0.53	0.40	3824	−0.23	0.32	0.36	4140	−0.32	0.44	0.39
Vertebral ultimate stiffness, Ku	N/mm	4315	−0.58	0.73	0.59	2925	−0.35	0.34	0.33	3337	−0.47	0.55	0.43