Table 3.

Summary of pelvimetry ratios

Measurement	Male (n = 34)			Female (n = 38)
	Median (Q1, Q3)	Mean (SD)	Correlation coefficienta	Median (Q1, Q3)	Mean (SD)	Correlation coefficienta
Ratio of the pelvic inlet
$\frac{\#11}{\#12}$	1.17 (1.09,1.32)	1.21 (0.16)	−0.43	1.26 (1.15, 1.49)	1.33 (0.20)	−0.65
Ratios of the transverse diameters of the pelvis
$\frac{\#3}{\#1}$	0.46 (0.44, 0.48)	0.46 (0.03)	−0.04	0.48 (0.45, 0.50)	0.48 (0.03)	−0.30
$\frac{\#11}{\#1}$	0.47 (0.45, 0.52)	0.49 (0.06)	−0.57	0.49 (0.45, 0.56)	0.51 (0.07)	−0.66
$\frac{\#13}{\#1}$	0.32 (0.29, 0.33)	0.31 (0.04)	−0.10	0.35 (0.30, 0.37)	0.34 (0.04)	−0.17
$\frac{\#14}{\#1}$	0.30 (0.28, 0.33)	0.30 (0.03)	−0.07	0.32 (0.29, 0.34)	0.31 (0.03)	−0.44
$\frac{\#3}{\#2}$	0.48 (0.46, 0.50)	0.49 (0.04)	−0.09	0.51 (0.47, 0.52)	0.50 (0.04)	−0.43
$\frac{\#11}{\#2}$	0.49 (0.48, 0.55)	0.51 (0.06)	−0.60	0.51 (0.48, 0.60)	0.54 (0.08)	−0.71
$\frac{\#13}{\#2}$	0.33 (0.30, 0.34)	0.33 (0.04)	−0.12	0.36 (0.31, 0.40)	0.36 (0.05)	−0.27
$\frac{\#14}{\#2}$	0.31 (0.29, 0.34)	0.32 (0.03)	−0.11	0.34 (0.31, 0.36)	0.33 (0.04)	−0.51
$\frac{\#13}{\#3}$	0.68 (0.64, 0.71)	0.68 (0.07)	−0.07	0.70 (0.66, 0.75)	0.71 (0.07)	0.02
$\frac{\#14}{\#3}$	0.64 (0.62, 0.69)	0.66 (0.05)	−0.03	0.66 (0.62, 0.70)	0.66 (0.06)	−0.30
$\frac{\#13}{\#11}$	0.66 (0.57, 0.70)	0.64 (0.08)	0.44	0.67 (0.60, 0.73)	0.67 (0.09)	0.47
$\frac{\#14}{\#11}$	0.63 (0.60, 0.67)	0.62 (0.07)	0.54	0.63 (0.56, 0.69)	0.63 (0.08)	0.26
$\frac{\#13}{\#14}$	1.03 (0.97, 1.09)	1.04 (0.11)	−0.04	1.07 (1.00, 1.15)	1.08 (0.11)	0.27
Ratios of the cranial-to-caudal diameter of the pelvis
$\frac{\#8}{\#7}$	0.68 (0.67, 0.69)	0.68 (0.01)	0.18	0.67 (0.66, 0.69)	0.68 (0.02)	−0.12
$\frac{\#10}{\#7}$	0.33 (0.33, 0.34)	0.33 (0.01)	0.35	0.33 (0.33, 0.34)	0.33 (0.01)	0.30
$\frac{\#10}{\#8}$	0.49 (0.47, 0.51)	0.49 (0.02)	0.22	0.49 (0.48, 0.51)	0.49 (0.03)	0.26
Aspect ratios length-to-width of the sacrum
$\frac{\#17}{\#15+\#16}$	1.02 (0.98, 1.07)	1.03 (0.07)	0.08	1.05 (1.00, 1.10)	1.06 (0.08)	−0.50
$\frac{\#18}{\#15+\#16}$	0.81 (0.78, 0.84)	0.81 (0.06)	−0.21	0.83 (0.81, 0.87)	0.84 (0.07)	−0.57
$\frac{\#19}{\#15+\#16}$	0.58 (0.53, 0.63)	0.59 (0.07)	−0.32	0.61 (0.56, 0.64)	0.60 (0.06)	−0.23

Q1 first quartile, Q3 third quartile, SD standard deviation.

^aPearson’s correlation coefficient of crown-rump length and pelvimetry ratio.