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Table 2: Dimensions of DRGs
Level of DRG
L5 L4 L3 L2 L1
Width (mm) 
    Female 6.22 ± 0.86 5.75 ± 0.84 5.25 ± 0.91 4.35 ± 0.88 3.23 ± 0.75
    Male 6.60 ± 0.93 5.92 ± 1.03 5.49 ± 1.00 4.69 ± 0.86 3.55 ± 0.75
    Combined 6.40 ± 0.91 5.83 ± 0.94 5.37 ± 0.96 4.51 ± 0.88 3.38 ± 0.77
    P value^* 0.025 (2.270)^† 0.331 (0.975) 0.189 (1.323) 0.038 (2.099)^† 0.026 (2.254)^†
Length (mm) 
    Female 11.55 ± 2.45 8.47 ± 1.45 7.05 ± 1.41 5.66 ± 1.03 4.14 ± 0.88
    Male 11.61 ± 2.02 8.82 ± 1.52 7.36 ± 1.30 6.07 ± 1.17 4.58 ± 0.85
    Combined 11.58 ± 2.25 8.64 ± 1.49 7.20 ± 1.36 5.85 ± 1.11 4.35 ± 0.89
    P value^* 0.884 (0.147) 0.200 (1.288) 0.222 (1.229) 0.044 (2.037)^† 0.007 (2.749)^†
Width/Length 
    Female 0.28 ± 0.06 0.35 ± 0.05 0.38 ± 0.04 0.39 ± 0.04 0.39 ± 0.05
    Male 0.29 ± 0.05 0.34 ± 0.06 0.37 ± 0.04 0.39 ± 0.04 0.39 ± 0.04
    Combined 0.28 ± 0.05 0.34 ± 0.06 0.39 ± 0.04 0.39 ± 0.04 0.39 ± 0.05
    P value^* 0.225 (1.221) 0.630 (0.483) 0.739 (0.334) 0.565 (0.577) 0.601 (0.525)
Note:—Data are presented as mean ± SD. DRG indicates dorsal root ganglion.
* t test between women and men (t values in parentheses).
† The width and length of the L1 and L2 DRGs, and the width of the L5 DRGs differ statistically between men and women.

	Level of DRG
	L5	L4	L3	L2	L1
Width (mm)
Female	6.22 ± 0.86	5.75 ± 0.84	5.25 ± 0.91	4.35 ± 0.88	3.23 ± 0.75
Male	6.60 ± 0.93	5.92 ± 1.03	5.49 ± 1.00	4.69 ± 0.86	3.55 ± 0.75
Combined	6.40 ± 0.91	5.83 ± 0.94	5.37 ± 0.96	4.51 ± 0.88	3.38 ± 0.77
P value^*	0.025 (2.270)^†	0.331 (0.975)	0.189 (1.323)	0.038 (2.099)^†	0.026 (2.254)^†
Length (mm)
Female	11.55 ± 2.45	8.47 ± 1.45	7.05 ± 1.41	5.66 ± 1.03	4.14 ± 0.88
Male	11.61 ± 2.02	8.82 ± 1.52	7.36 ± 1.30	6.07 ± 1.17	4.58 ± 0.85
Combined	11.58 ± 2.25	8.64 ± 1.49	7.20 ± 1.36	5.85 ± 1.11	4.35 ± 0.89
P value^*	0.884 (0.147)	0.200 (1.288)	0.222 (1.229)	0.044 (2.037)^†	0.007 (2.749)^†
Width/Length
Female	0.28 ± 0.06	0.35 ± 0.05	0.38 ± 0.04	0.39 ± 0.04	0.39 ± 0.05
Male	0.29 ± 0.05	0.34 ± 0.06	0.37 ± 0.04	0.39 ± 0.04	0.39 ± 0.04
Combined	0.28 ± 0.05	0.34 ± 0.06	0.39 ± 0.04	0.39 ± 0.04	0.39 ± 0.05
P value^*	0.225 (1.221)	0.630 (0.483)	0.739 (0.334)	0.565 (0.577)	0.601 (0.525)