Table 1. Patient characteristics and prevalence of DE determined with qualitative and quantitative methods.

	LDS (n = 10)	MFS (n = 20)	Control (n = 20)	Difference*
Gene abnormality	TGFBR-1 or -2	FBN-1
Gender (m:f)	6∶4	12∶8	12∶8	NS
Age (y)	36.3±12.6	37.1±11.2	36.1±8.6	NS
No. of DE identified with qualitative method
DE-positive	4 (40)	16 (80)	0 (0)	a, (p = 0.04); b, (p = 0.0077); c, (p<0.0001)
No. of DE identified with method-1
DE-positive	5 (50)	15 (75)	0 (0)	b, (p = 0.0018); c, (p<0.0001)
No. of DE identified with method-2
DE-positive at any level	7 (70)	17 (85)	1 (5)	b, (p = 0.00068); c, (p<0.0001)
L1	4 (40)	3 (15)	1 (5)
L2	3 (30)	3 (15)	0 (0)
L3	3 (30)	3 (15)	0 (0)
L4	0 (0)	4 (20)	0 (0)
L5	2 (20)	7 (35)	1 (5)
S1	6 (60)	16 (80)	0 (0)

LDS, Loeys-Dietz syndrome; MFS, Marfan syndrome; DSR, dural sac ratio; DE, dural ectasia; NS, not significant; a, difference between LDS and MFS; b, difference between LDS and control; c, difference between MFS and control.

Difference*, In this column, p values are shown. Differences were not tested for each level from L1 to S1.