Table 2:

Average (N/M) ratio at each vertebral level for each age category.

Age categories (years)	L1	L2	L3	L4	L5	Average (L1–L5)
20–29	0.6880±(0.27286) (0.43–1.41)	0.5321±(0.07588) (0.40–0.61)	0.4726±(0.05410) (0.38–0.57)	0.4919±(0.07193) (0.37–0.62)	0.5241±(0.12628) (0.28–0.75)	0.510±0.129
30–39	0.5105±(0.08117) (0.33–0.69)	0.4552±(0.07395) (0.30–0.61)	0.4217±(0.07937) (0.30–0.58)	0.4096±(0.08036) (0.24–0.54)	0.4494±(0.10839) (0.24–0.81)
40–49	0.5232±(0.12199) (0.33–0.77)	0.4818±(0.12413) (0.26–0.80)	0.4375±(0.09911) (0.25–0.68)	0.4175±(0.10540) (0.17–0.69)	0.4402±(0.10419) (0.24–0.74)
50–59	0.5122±(0.08395) (0.26–0.65)	0.4660±(0.09598) (0.24–0.86)	0.4097±(0.08151) (0.18–0.61)	0.4213±(0.08971) (0.26–0.64)	0.4695±(0.12478) (0.27–0.93)
60–69	0.5189±(0.08854) (0.38–0.70)	0.4524±(0.07747) (0.32–0.62)	0.4367±(0.12583) (0.25–0.93)	0.4441±(0.07890) (0.32–0.63)	0.4742±(0.08689) (0.31–0.73)
≥70	0.5147±(0.11411) (0.16–0.71)	0.4699±(0.10032) (0.23–0.62)	0.4341±(0.08724) (0.22–0.62)	0.4304±(0.10498) (0.24–0.67)	0.4517±(0.09581) (0.31–0.65)