Table 2.

Percentage changes of lumbar intervertebral foramen dimensions for the male and female (mean ± SD, %)

Location	Right			Left			All
	Male	Female	P	Male	Female	P	Male	Female	P
L1–2
Area	19.7 ± 6.3	20.3 ± 7.0	0.81	20.2 ± 6.5	20.4 ± 6.5	0.93	20.0 ± 6.3	20.3 ± 6.6	0.81
Height	9.7 ± 4.1	9.1 ± 2.9	0.58	10.1 ± 4.5	9.1 ± 3.1	0.43	9.9 ± 4.3	9.1 ± 3.0	0.33
Width	12.8 ± 7.7	12.6 ± 6.6	0.95	11.9 ± 8.6	14.0 ± 6.9	0.44	12.3 ± 8.0	13.3 ± 6.7	0.59
L2–3
Area	22.0 ± 4.7	23.6 ± 8.2	0.49	21.9 ± 4.7	23.1 ± 8.4	0.62	22.0 ± 4.6	23.4 ± 8.2	0.39
Height	10.3 ± 3.1	10.7 ± 4.9	0.73	10.2 ± 3.1	10.8 ± 4.5	0.66	10.2 ± 3.1	10.7 ± 4.7	0.57
Width	13.1 ± 4.8	16.6 ± 9.9	0.20	12.4 ± 6.3	16.1 ± 9.5	0.19	12.7 ± 5.6	16.3 ± 9.6	0.06
L3‐4
Area	20.8 ± 7.9	19.0 ± 7.4	0.49	21.1 ± 8.2	18.6 ± 7.6	0.35	21.0 ± 8.0	18.8 ± 7.4	0.24
Height	8.7 ± 3.8	10.3 ± 4.2	0.24	9.1 ± 4.1	9.9 ± 4.2	0.57	8.9 ± 3.9	10.1 ± 4.1	0.21
Width	15.1 ± 9.4	11.5 ± 7.5	0.23	14.5 ± 10.0	10.7 ± 8.1	0.23	14.8 ± 9.6	11.1 ± 7.7	0.08
L4‐5
Area	18.2 ± 8.0	17.5 ± 6.1	0.75	18.4 ± 8.5	18.1 ± 5.9	0.91	18.3 ± 8.1	17.8 ± 5.9	0.76
Height	9.3 ± 4.3	9.8 ± 4.4	0.74	9.3 ± 4.2	9.9 ± 4.5	0.69	9.3 ± 4.2	9.9 ± 4.4	0.59
Width	10.8 ± 8.1	10.3 ± 3.7	0.83	11.8 ± 6.7	8.7 ± 5.6	0.15	11.3 ± 7.3	9.5 ± 4.7	0.23
L5‐S1
Area	12.9 ± 3.8	11.2 ± 4.9	0.26	12.5 ± 4.6	11.1 ± 4.9	0.39	12.7 ± 4.2	11.2 ± 4.8	0.15
Height	6.4 ± 2.6	6.1 ± 3.9	0.78	6.9 ± 3.9	5.0 ± 4.6	0.18	6.7 ± 3.3	5.5 ± 4.3	0.21
Width	8.6 ± 6.9	8.3 ± 6.3	0.92	9.0 ± 6.7	7.6 ± 6.1	0.54	8.8 ± 6.7	8.0 ± 6.1	0.61