Table 4.

Characteristics of prophylaxis in patients with hospitalization or major surgery within three months of subsequently developing venous thromboembolism.^*

		Chronic obstructive pulmonary disease
	Total (n=2488)	Yes (n = 435)	No (n = 1644)	p-value
Receiving any prophylaxis, n (%)	1027 (49.4)	261 (60)	766 (46.6)	<0.0001
Pneumatic compression devices, n (%)	564 (27.1)	115 (26.4)	449 (27.3)	0.71
Subcutaneous unfractionated heparin, n (%)	454 (21.8)	132 (30.3)	322 (19.6)	<0.0001
Intravenous unfractionated heparin, n (%)	128 (6.2)	31 (7.1)	97 (5.9)	0.35
Low-molecular weight heparin, n (%)	188 (9.0)	47 (10.8)	141 (8.6)	0.16
Warfarin, n (%)	99 (4.8)	32 (7.4)	67 (4.1)	0.01

^*Patients could have received more than one prophylactic modality.