Construction of a nomogram model to predict technical difficulty in performing laparoscopic sphincter-preserving radical resection for rectal cancer

Table 5 Pelvic bone parameters and soft tissue parameters data of 162 patients undergoing laparoscopic radical sphincter-preserving surgery for rectal cancer

Measurement	mean ± SD or median (Q1, Q3) (range)
Anterior-posterior diameter of pelvic inlet (mm)	115.23 ± 11.79
Transverse diameter of pelvic inlet (mm)	123.52 ± 8.14
Anterior-posterior diameter of mid-pelvis (mm)	111.83 (106.36, 117.74)
Anterior-posterior diameter of pelvic outlet (mm)	88.97 (82.35, 96.86)
Interischial spine diameter (mm)	96.06 (87.3, 104.27)
Interischial tuberosity diameter (mm)	106.63 ± 14.15
Superior-inferior diameter of pubic symphysis (mm)	42.25 (39.31, 45.42)
Sacrococcygeal distance (mm)	123.19 ± 11.95
Superior-inferior diameter of sacrum (mm)	105.77 ± 10.17
Sacrococcygeal curvature height (mm)	39.61 (36.15, 42.71)
Sacral curvature height (mm)	20.82 ± 5.87
Superior pubococcygeal diameter (mm)	120.26 ± 9.56
Anterior-posterior sacropubic distance (mm)	119.84 (113.14, 126.49)
Sacrococcygeal-pubic angle (°)	48.05 ± 7.01
Sacropubic angle (°)	33.04 ± 5.43
Anterior-posterior diameter of pelvic inlet/sacrococcygeal distance	0.94 (0.86, 1)
Rectal area (cm2)	16.67 (12.23, 21.48)
Mesorectal fat area (cm2)	39.26 (27.41, 51.62)
Visceral fat area (cm2)	215.9 (126.21, 274.02)
Subcutaneous fat area (cm2)	258.24 (198.25, 340.77)
Waist circumference (cm)	82.37 ± 9.15
Anterior-posterior abdominal diameter (cm)	18.42 ± 2.91
Transverse abdominal diameter (cm)	28.84 ± 2.79

If the data follows a normal distribution, it is represented as mean ± SD. If the data does not follow a normal distribution, it is represented as median (Q1, Q3).