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Table 1 Preoperative profiles of patients in this study

From: Comparison of robot-assisted retroperitoneal laparoscopic adrenalectomy versus retroperitoneal laparoscopic adrenalectomy for large pheochromocytoma: a single-centre retrospective study

Variable RLA (n = 32) RARLA (n = 19) p value
Demographic characteristics
 Age(years) 47.53 ± 14.048 44 ± 9.062 0.332&
 Gender
  Female 17(53.1) 8(42.1) 0.447
  Male 15(46.9) 11(57.9)  
 BMI (kg/m2) 25.83 ± 4.45 26.64 ± 3.82 0.5116&
Comorbidities
 ASA score
  I/II 7(21.9) 1(5.3) 0.238
  III/IV 25(78.1) 18(94.7)  
 NNIS
  0/1 23(71.9) 12(63.2) 0.517
  2/3 9(28.1) 7(36.8)  
 Coronary heart disease (CHD) 8(25.0) 5(26.3) 0.917
 Hypertension 30(93.75) 18(94.74) 0.6379
 Diabetes 16(50.0) 9(47.4) 0.856
 Arrhythmia 10(31.2) 7(36.8) 0.682
Tumor characteristics
 Laterality
  Left 16(50) 9(47.4) 0.856
  Right 16(50) 10(52.6)  
 Diameter of tumor 7.65(6.625, 9) 8(6, 9) 0.859§
  1. Continuous normally distributed variables were expressed as the mean ± standard deviation (SD); Continuous non-normally distributed variables were expressed as the median (interquartile range); categorical variables are expressed as the number (percentage). Independent sample t-test was used to compare the differences between the means of two continuous normally distributed variables and Mann-Whitney U test was used to compare the differences between the means of two continuous non-normal distribution variables. Chi-square test was used to compare the differences between the categorical variables
  2. & Independent sample t-test, § Mann-Whitney U test, ASA American Society of Anesthesiologists, BMI Body mass index, NNIS National Nosocomial Infections Surveillance RLA Retroperitoneal laparoscopic adrenalectomy, RARLA Robotic assisted retroperitoneal laparoscopic adrenalectomy