Table 1. Preoperative variables.

Variable	NON-ARD	ARD	OR (95% CI)	p-value
	(n = 90)	(n = 111)
Mean age [years]	58.6 ± 13.1	62.6 ± 12.1	1.03 (1.00, 1.05)	0.031*
Male (ref. female)	56 [43]	75 [57]	1.27 (0.71, 2.3)	0.429
BMI [kg/m²]	26.9 ± 3.9	28.4 ± 4.3	1.09 (1.02, 1.17)	0.017*
ASA	3.9 ± 0.4	3.9 ± 0.5	1.05 (0.59, 1.89)	0.865
Arterial hypertension (ref. no)	67 [43]	89 [57]	1.39 (0.71, 2.70)	0.333
Coronary heart disease (ref. no)	8 [42]	11 [58]	1.13 (0.43, 2.93)	0.806
Aneurysm (ref. yes)	18 [51]	17 [49]	1.38 (0.67, 2.87)	0.385
AI (ref. yes)	39 [46]	45 [54]	1.12 (0.64, 1.97)	0.690
Pericardial disease (ref. no)	23 [42]	32 [58]	1.18 (0.63, 2.21)	0.605
Ischemia of the organ (ref. no)	2 [29]	5 [71]	2.08 (0.39, 10.96)	0.390
Ischemia of the limb (ref. no)	10 [38]	16 [62]	1.35 (0.58, 3.13)	0.489
COPD (ref. no)	4 [36]	7 [64]	1.45 (0.41, 5.11)	0.566
Nicotine (ref. no)	17 [38]	28 [62]	1.45 (0.73, 2.86)	0.285
Diabetes mellitus (ref. no)	4 [29]	10 [71]	2.13 (0.65, 7.03)	0.215
Chronic renal insufficiency (ref. yes)	5 [46]	6 [55]	1.03 (0.30, 3.49)	0.963
Neurological complication (ref. yes)	25 [46]	29 [54]	1.09 (0.58, 2.03)	0.793
CRP [mg/L]	5.6 (2.9–41.8)	6.6 (2.9–20.5)	1.00 (0.99, 1.01)	0.753
Leukocytes [/nL]	12.7 ± 4.0	12.7 ± 4.2	1.00 (0.93, 1.07)	0.995
CK [U/L]	104.0 (69.0–169.0)	100.0 (70.0–169.0)	1.00 (1.00, 1.00)	0.368

AI: aortic insufficiency; ARD: acute respiratory dysfunction; ASA: Score of the American Society of Anesthesiologists; BMI: body mass index; CK: creatine kinase; COPD: chronic obstructive pulmonary disease; CRP: C-reactive protein; Ischemia of the organ: heart, liver or kidney; Neurological complication: includes hemiplegia, paresis, seizure or stroke; Pericardial disease: includes effusion or tamponade.

All data are presented as the mean ± standard deviation, number [row-wise %] or median (IQR = interquartile range).

*: p < 0.05; p-value: logistic regression. Odds ratio (OR) and 95% confidence interval (95% CI).