Table 4:

Interobserver variation in pelvimetry measurements

Characteristic	Median (range)		r †	P value
	First observer	Second observer
Inlet length	11.87 (9.51–14.55)	12.00 (9.30–15.00)	0.951	<0.001
Outlet length	9.03 (6.50–12.11)	9.20 (6.70–12.80)	0.858	<0.001
Sacral height	12.10 (7.57–16.83)	12.10 (5.10–16.70)	0.901	<0.001
Sacral depth	3.97 (1.46–6.18)	4.00 (1.60–11.70)	0.873	<0.001
Pubic tubercle height	4.23 (2.56–6.03)	4.10 (2.70–7.80)	0.675	<0.001
Interspinous distance	9.99 (7.04–13.34)	9.80 (7.10–13.20)	0.905	<0.001
Mesorectal area	34 (7–72)	27 (2–62)	0.645	<0.001

^†Spearman’s correlation coefficient. N=372 for all measurements except interspinous distance (N=378) and mesorectal area (N=327).