Table 3. Width of the left psoas major in the middle frontal plane ($\overline{\mathrm{x}}$ ± S, cm).

Psoas major width	L1-2	L2-3	L3-4	L4-5
Male	0.53 ± 0.47 (0.00–1.56)	1.46 ± 0.51 (0.81–2.50)	2.32 ± 0.63 (1.21–3.59)	3.46 ± 0.64 (2.55–4.63)
Female	0.33 ± 0.23 (0.00–0.92)	0.92 ± 0.25 (0.34–1.42)	1.51 ± 0.32 (0.91–2.36)	2.58 ± 0.60 (0.00–3.41)
P	0.048	0.000	0.000	0.000
Male + female	0.43 ± 0.38 (0.00–1.56)	1.19 ± 0.49 (0.34–2.50)	1.92 ± 0.64 (0.91–3.59)	3.02 ± 0.76 (0.00–4.63)	P = 0.000