Factors affecting operating time in laparoscopic anterior resection of rectal cancer

Table 2 Statistical results of factors affecting operating time

Variables (unit)	Description mean ± SD (minimal, maximal) or median (interquartile range)	Correlation with operating time
		r or F	P
Operating time (min)	171.43 ± 48.18 (100, 260)	-	-
Age (years old)	65.50 ± 7.12 (54, 76)	0.174	0.553
Gender^a	-	3.102	0.138
NACR^a	-	0.937	0.377
BMI^b	22.88 (21.94, 24.57)	0.779	0.001
VFA (cm²)	106.83 ± 47.19 (4.52, 162.07)	0.296	0.304
diameter of tumor (cm)	2.91 ± 1.32 (1, 5)	-0.225	0.439
T stage of tumor^a	-	0.736	0.606
Td (cm)^b	8.00 (6.75, 10.0)	-0.328	0.252
IA (mm)	128.76 ± 12.22 (111.36, 158.92)	-0.771	0.001
IS (mm)	104.65 ± 15.47 (84.55, 131.36)	-0.760	0.002
IT (mm)	101.24 ± 17.89 (79.71, 134.63)	-0.704	0.005
IP (mm)	133.97 ± 16.30 (113.21, 170.18)	-0.676	0.008
SyPr (mm)	120.74 ± 12.78 (99.47, 145.94)	0.066	0.822
S3Pr (mm)	82.54 ± 9.61 (63.77, 99.28)	-0.063	0.831
S3Co (mm)	69.12 ± 8.94 (56.11, 87.20)	0.494	0.072
PrCo (mm)	137.82 ± 14.24 (117.77, 175.47)	0.304	0.291
ScDep (mm)	32.99 ± 4.54 (22.16, 41.45)	0.077	0.793
CoSy (mm)	103.99 ± 11.33 (86.17, 121.51)	-0.646	0.013
SyLn (mm)	40.27 ± 4.80 (30.73, 47.50)	-0.032	0.913
Angle 1 (°)	84.86 ± 12.16 (62.99, 109.48)	-0.430	0.125
Angle 2 (°)	130.78 ± 8.47 (111.80, 142.61)	0.137	0.640
Angle 3 (°)	92.22 ± 6.46 (77.98, 103.87)	0.146	0.619
Angle 4 (°)	131.79 ± 7.96 (117.39, 146.16)	-0.504	0.066
Angle 5 (°)	100.17 ± 9.99 (84.11, 123.25)	0.716	0.004

^aUnivariate analysis was applied.
^bSpearman’s ranking correlation coefficient was applied. For the rest of the variables, Pearson’s correlation coefficient was applied.
BMI: body mass index; CoSy: distance from the lower border of symphysis pubis to the tip of coccyx; IA: interacetabular distance; IP: anatomical transverse distance; IS: interischial distance; IT: intertuberous distance; NACR: neoadjuvant chemoradiotherapy; PrCo: distance from the sacral promontory to the tip of coccyx; ScDep: distance from the deepest point of sacrum to the promontory-coccyx line; SyLn: Length of symphysis pubis; SyPr: distance from the upper border of symphysis pubis to sacral promontory; S3Co: distance from the middle point of the third sacrum to the tip of the coccyx; S3Pr: distance from the middle point of the third sacrum to sacral promontory; Td: tumor distance from the anal verge; VFA: visceral fat area.

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