Table 1 General patient characteristics of the two study groups at the time of surgery

Sex (m/f)

29 (66%)/

15 (34%)

22 (67%)/

11 (33%)

\({\chi }^{2}\)(1) = 0.005, p = 0.945, φ = 0.01

Age

52 ± 12

41 ± 14

t(75) = 3.67, p < 0.001

BMI

26 ± 5

26 ± 5

t(75) = − 0.15, p = 0.885

ASA-Classification

I

II

III

10 (22.7%)

30 (68.2%)

4 (9.1%)

14 (42.4%)

16 (48.5%)

3 (9.1%)

U = 596.00, z = 1.54, p = 0.124

aHT

13 (30%)

9 (27%)

\({\chi }^{2}\)(1) = 0.05, p = 0.827, φ = − 0.03

COPD

2 (5%)

0 (0%)

p = 0.504, φ = − 0.14

Diabetes mellitus

2 (5%)

3 (9%)

p = 0.646, φ = 0.09