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Table 1 The population characteristics of patients

From: Application of data mining for predicting hemodynamics instability during pheochromocytoma surgery

  Without IHD n = 209 (73.9) With IHD n = 74 (26.1) p-value
Demographic characteristics
 Mean age (years) 51.9 ± 12.3 54.0 ± 13.8 0.233
 Sex (male/female) 110 (52.6) / 99 (47.4) 31 (41.9) / 43 (58.1) 0.112
 BMI (kg/m2) 24.1 ± 3.5 21.9 ± 2.7 <  0.001
 ASA score 1/2/3 52(24.9)/136(65.1)/21(10.0) 14(18.9)/53(71.6)/7(9.5) 0.548
Comorbidity
 Diabetes mellitus 61 (29.2) 23 (31.1) 0.759
 Coronary heart disease 66 (31.6) 37 (50.0) 0.005
 Hypertension Normal/Intermittent/Continuous 82(39.2)/47(22.5)/80(38.3) 30(40.5)/18(24.3)/26(35.1) 0.883
 Arrhythmia 12 (5.7) 4 (5.4) 0.914b
Preoperative data
 Tumor side (left/right) 103 (49.3) / 106 (50.7) 39 (52.7) / 35 (47.3) 0.613
 Radiographic tumor size (cm) 5.2 ± 2.5 6.5 ± 3.1 <  0.001
 Tumor necrosis 69 (33.0) 33 (44.6) 0.075
 Tumor enhanced CT difference (Hu) 43.2 ± 20.6 45.6 ± 20.2 0.435
 Use of α adrenoreceptor antagonists 115 (55.0) 42 (56.8) 0.797
 Use of crystal/colloid fluid 118 (56.5) 29 (39.2) 0.011
 Use of blood transfusion 54 (25.8) 15 (20.3) 0.338
 24-h urine metanephrines/ normal upper limit 1.4 (0.9–2.2) 1.47 (0.9–2.7) 0.153a
Intraoperative data
 Laparoscopic vs. Open 109 (52.2) / 100 (47.8) 42 (56.8) / 32 (43.2) 0.495
  1. Continuous variables with normal distribution are reported as the mean ± standard deviation (SD), while non-normal continuous variables as the median (interquartile range) and categorical variables as numbers (percentages). Student’s t-test was used to compare the mean values of two continuous normally distributed variables and the Mann–Whitney U-test was used to determine mean values of two continuous non-normally distributed variables. The chi-squared or Fisher’s exact test was used for categorical variables
  2. a Mann–Whitney U-test
  3. b Fisher’s exact test
  4. BMI body mass index; ASA American Society of Anesthesiologists; CT computed tomography; IHD intraoperative hemodynamic instability