Table 1. Baseline demographics of all patients and subgroups.

Variable	Overall	Group S (emergency surgery), N=36	Group W (watchful waiting), N=57	P
Age (years)	63.9±8.7	63.6±10.0	64.1±7.9	0.80
Male sex	36 (38.7)	13 (36.1)	23 (40.4)	0.68
Hypertension	70 (75.3)	27 (75.0)	43 (75.4)	0.96
Diabetes mellitus	7 (7.5)	3 (8.3)	4 (7.0)	0.81
Dyslipidemia	38 (40.9)	14 (38.9)	24 (42.1)	0.75
End-stage renal failure	1 (1.1)	0	1 (1.8)	0.42
History of myocardial infarction	4 (4.3)	0	4 (7.0)	0.10
History of cerebrovascular accident	1 (1.1)	0	1 (1.8)	0.42
Ascending aortic calibre (mm)	45.7±4.9	47.8±5.3	44.4±4.2	0.001
Hematoma thickness (mm)	11.3±5.7	15.8±5.9	8.5±3.2	<0.0001
Pleural effusion	4 (4.3)	2 (5.6)	2 (3.5)	0.63
Pericardial effusion	20 (21.5)	14 (38.9)	6 (10.5)	0.001
Cardiac tamponade	7 (7.5)	6 (16.7)	1 (1.8)	0.008
Penetrating aortic ulcer or ulcer-like projection in distal aorta	34 (36.6)	17 (47.2)	17 (29.8)	0.09

Data are presented as n (%) or mean ± standard deviation.