Table 2.

identified venous thromboembolism risk factors

Risk factor	Surgical	Medical	Percentage	Chi Square/Fisher exact value	p-value
Age 40 - 59	19	41	25.3%	0.001	0.999
Age 60 - 74	13	17	12.7%	41.46	<0.001
Age > 75	4	5	3.8%	34.12	<0.001
History of prior major surgery	19	9	11.8%	28.88	<0.001
Minor surgery planned	22	0	9.3%	0.46	0.585
Major surgery lasting > 60 minutes	10	4	5.9%	19.07	<0.001
Elective major lower extremity arthroplasty	1	0	0.4%	3.67	0.215
Obesity (BMI > 30)	14	12	11.0%	64.87	<0.001
Oral contraceptive use	3	1	1.7%	1.12	0.580
Pregnancy or post-partum (< 1 month)	1	0	0.4%	0.28	0.999
Swollen legs	5	1	2.5%	2.96	0.116
Varicose veins	2	0	0.8%	7.36	0.046
Leg plaster cast or brace	1	0	0.4%	3.67	0.215
Hip, pelvis or leg fracture (< 1 month)	1	0	0.4%	3.67	0.215
Travel history	0	1	0.4%	0.28	0.999
Bed rest	3	26	12.2%	5.27	0.022
Serious lung disease (< 1 month)	0	3	1.3%	3.67	0.118
Congestive heart failure (< 1 month)	0	3	1.3%	0.251	0.518
Sepsis (< 1 month)	1	1	0.8%	7.36	0.046
Stroke (< 1 month)	0	1	0.4%	3.67	0.215
Present cancer or chemotherapy	0	1	0.4%	3.67	0.215
Gender	88	149	100%	1.01	0.338