Study on sex differences and potential clinical value of three-dimensional computerized tomography pelvimetry in rectal cancer patients

Table 5 mean ± standard deviation or median (Q1, Q3) of 16 pelvic parameters and 7 soft tissue parameters measured by 218 computerized tomography scans and comparison between sexes

Variable name	Total cases (n = 218), mean ± SD or median (Q1, Q3)	Male (n = 139), mean ± SD or median (Q1, Q3)	Female (n = 79), mean ± SD or median (Q1, Q3)	Mean comparison between sexes, P value
Anterior-posterior diameter of pelvic inlet in mm	114.36 ± 11.99	110.57 ± 10.84	121.03 ± 11.01	0.0000a
Transverse diameter of pelvic inlet in mm	123.3 ± 8.14	119.81 ± 6.57	129.44 ± 6.93	0.0000a
Anterior-posterior diameter of mid pelvis in mm	111.59 (105.76, 117.26)	109.06 (103.5, 114.76)	113.94 (109.81, 121.44)	0.0000a
Anterior-posterior diameter of pelvic outlet in mm	88.34 (82.35, 95.73)	86.45 (80.03, 91.33)	93.12 (85.32, 99.8)	0.0000a
Interischial spine diameter in mm	95.92 (88.9, 104.09)	90.77 (84.88, 96.05)	106.73 (102.53, 112.28)	0.0000a
Interischial tuberosity diameter	104.88 (96.78, 116.95)	99.58 (93.26, 108.12)	117.37 (109.52, 126.2)	0.0000a
Superior-inferior diameter of pubic symphysis in mm	41.8 ± 4.92	43.11 ± 4.99	39.49 ± 3.82	0.0000a
Sacrococcygeal distance in mm	122.92 ± 12.02	125.23 ± 11.53	118.84 ± 11.83	0.0002a
Superior-inferior diameter of sacrum in mm	105.36 ± 10.35	106.76 ± 9.79	102.9 ± 10.89	0.0101a
Sacrococcygeal curvature height in mm	39.15 (35.81, 42.96)	39.7 (36.42, 44.05)	38.3 (34.67, 41.45)	0.0204a
Sacral curvature height in mm	20.87 ± 5.66	21.14 ± 5.74	20.38 ± 5.53	0.3385
Superior pubococcygeal diameter in mm	119.39 ± 9.27	119.41 ± 8.68	119.34 ± 10.29	0.9596
Anterior-posterior sacropubic distance in mm	119.6 (113.39, 126.28)	117.03 (112.54, 123.58)	123.86 (116.48, 130.88)	0.0000a
Sacrococcygeal angle (°)	48.37 ± 7.28	50.7 ± 6.67	44.26 ± 6.47	0.0000a
Sacropubic angle (°)	33.01 (29.28, 36.75)	34.24 (30.42, 37.42)	31.48 (28.09, 35.24)	0.0028a
Anterior-posterior diameter of pelvic inlet/sacrococcygeal distance	0.93 (0.85, 0.99)	0.88 (0.83, 0.94)	0.99 (0.96, 1.08)	0.0000a
Rectal area in cm2	16.67 (12.12, 21.69)	16.69 (11.48, 21.99)	16.57 (12.44, 21.39)	0.8389
Mesorectal fat area in cm2	38.57 (26.71, 51.24)	44.17 (32.87, 53.19)	30.95 (21.2, 43.35)	0.0000a
Visceral fat area in cm2	202.65 (122.4, 259.89)	219.86 (125.28, 277.74)	174.12 (120.58, 242)	0.1184
Subcutaneous fat area in cm2	255.35 (184.82, 338.59)	235.63 (138.73, 294.54)	319.87 (226.14, 403.15)	0.0000a
Waist circumference in cm	81.69 ± 9.26	82.02 ± 9.45	81.1 ± 8.95	0.4744
Anterior-posterior abdominal diameter in cm	18.22 (16.14, 19.93)	18.26 (16.52, 20.35)	17.72 (15.29, 19.33)	0.0447a
Transverse abdominal diameter in cm	28.69 ± 2.78	28.72 ± 2.67	28.65 ± 2.99	0.8653

^aP value < 0.05. Measurement data that conforms to a normal distribution is represented by the mean ± standard deviation. If the data do not follow a normal distribution, they are represented by the median (Q1, Q3). All P values denoted by ‘e’ were found to be < 0.001.