Table 2.

Univariate correlations between patient/tumor variables and surgical difficulty

Variables	Correlation coefficient	P value*
Age	0.09	0.453
Sex	0.08	0.430
Operating time	0.46	0.00002
Front of head	0.1	0.334
Back of head	0.18	0.099
Back of neck	0.42	0.00004
Front of trunk	−0.08	0.530
Back of trunk	−0.32	0.005
Upper limb	−0.1	0.296
Lower limb	0.12	0.699
Volume of the tumor	0.03	0.817
Subfascial location
Intermuscular	−0.14	0.190
Intramuscular	0.29	0.006
Unenhanced CT	−0.06	0.529
Enhanced CT	−0.09	0.456
Unenhanced MRI	0.0006	0.996
Enhanced MRI	0.15	0.141
Broadly touching	0.37	0.0003
Minimally touching	−0.37	0.001
Multilocularity	0.14	0.143
Shaggy appearance	0.36	0.0006
In-flowing blood vessels	0.38	0.0002
Crossing the midline of the trunk	0.29	0.006
Unclear boundaries	0.37	0.0004
Normal fat tissue intervenes	−0.22	0.058
Infiltration pattern present	0.2	0.06
General anesthesia	0.12	0.237

P values less than 0.05 are shown in bold

CT computed tomography, MRI magnetic resonance imaging

*Pearson correlation analysis