Table 2.

Median Villalta score and postthrombotic syndrome severity rate from baseline to 1-year follow-up for iliofemoral deep vein thrombosis vs isolated femoral-popliteal deep vein thrombosis.

Outcomes	IF DVT		Isolated FP DVT
	Baseline	1 y	Baseline	1 y
Villalta score	n = 332	n = 213	n = 87	n = 59
Median [IQR]	9.0 [6.0-14.0]	1.0 [0.0-4.0]	10.0 [6.0-15.0]	2.0 [0.0-4.0]
P valuea		<.0001		<.0001
PTS severity	n = 332	n = 213	n = 87	n = 59
Severe PTS, %	24.7	3.3	28.7	5.1
Moderate PTS, %	20.5	4.7	27.6	8.5
Mild PTS, %	37.0	10.8	28.7	10.2
No PTS, %	17.8	81.2	14.9	76.3
P valuea		<.0001		.0001
Change in PTS severity from baseline		n = 186		n = 49
Improved or maintained no PTS, %		89.8		81.6
Maintained baseline severity, %		4.8		10.2
Worsened, %		5.4		8.2

DVT, deep vein thrombosis; FP, femoral-popliteal; IF, iliofemoral; PTS, postthrombotic syndrome.

^aP values derived from the Wilcoxon signed-rank test for the Villalta score and the McNemar-Bowker test for PTS severity between baseline and 1-y follow-up visit.