Table 6.

Disk Index in Each Disk Level (%).

Decade		20s	30s	40s	50s	60s	70s	Total
Males	T10/T11	25.1±4.3	26.6±5.7	25.0±4.4	25.7±5.9	28.5±5.4	26.9±5.8	26.3±5.4
	T11/T12	25.9±4.4	25.7±4.5	26.8±4.9	27.6±4.7	29.7±5.8	28.2±4.8	27.3±5.0
	T12/L1	25.5±3.8	26.4±3.6	27.1±4.9	28.4±4.7	30.4±5.1	30.2±5.0	28.0±4.9
	L1/L2	28.5±4.7	28.7±3.9	29.8±5.2	29.9±5.3	33.5±6.2	32.1±6.9	30.4±5.7
	L2/L3	32.5±5.3	33.5±4.6	34.0±5.4	35.1±5.4	35.2±7.4	31.8±8.8	33.7±6.4
	L3/L4	34.0±5.8	35.0±5.2	35.4±5.9	34.9±5.5	35.5±7.4	33.3±7.5	34.7±6.3
	L4/L5	34.6±6.4	35.1±4.7	34.5±8.5	32.8±7.5	35.1±9.8	30.4±10.5	33.7±8.2
	L5/S1	30.3±8.1	29.0±6.9	31.8±9.2	31.5±10.1	34.8±10.8	29.1±9.5	31.1±9.3
Decade		20s	30s	40s	50s	60s	70s	Total
Females	T10/T11	24.9±4.7	26.6±5.3	25.4±5.7	25.2±4.1	27.2±5.1	26.8±6.2	26.0±5.3
	T11/T12	25.0±4.2	28.4±4.8	26.9±5.7	26.7±4.6	28.2±5.5	28.4±7.2	27.3±5.5
	T12/L1	23.9±3.9	26.8±4.3	25.6±4.8	27.4±5.1	29.8±5.0	30.5±7.0	27.3±5.5
	L1/L2	26.4±4.6	28.2±4.5	28.7±5.2	30.8±4.4	32.5±5.9	32.6±7.9	29.9±6.0
	L2/L3	30.0±4.7	31.6±5.4	31.5±5.4	32.3±6.6	33.5±8.2	35.1±10.4	32.4±7.2
	L3/L4	32.0±4.9	33.3±5.7	32.3±6.3	32.4±6.5	33.0±7.9	35.0±8.9	33.0±6.9
	L4/L5	32.6±5.3	33.2±6.1	31.5±6.6	30.2±6.7	33.5±9.8	32.4±9.0	32.3±7.5
	L5/S1	29.6±6.6	29.0±6.3	30.7±9.2	27.6±7.8	31.3±11.0	32.8±10.2	30.2±8.8

Values given are means±standard deviation unless otherwise specified.