Table I.

Comparison of original cohort sample and the analyzed sample after exclusion of subjects in areas of nonoverlap of the propensity scores and empty comparison cells.

	Original cohort (702 patients)	After exclusion (618 patients)
Age (years), median (IQR)	58 (25)	60 (23)
Female, number (%)	328 (53)	300 (49)
Race, number (%)
Caucasian	422 (60)	392 (63)
African-American	251 (36)	204 (33)
Other	29 (4)	22 (4)
Chemotherapy, number (%)	39 (5)	38 (6)
Congestive heart failure, number (%)	42 (6)	40 (6)
Estrogen-containing medication, number (%)	4 (0.6)	4 (0.6)
History of recent trauma, number (%)	90 (13)	60 (10)
History of stroke, number (%)	43 (6)	39 (6)
History of venous thromboembolism, number (%)	124 (18)	108 (17)
Hypercoagulable state, number (%)	18 (3)	12 (2)
Pregnant, number (%)	6 (0.8)	4 (0.6)
Respiratory failure, number (%)	28 (4)	28 (5)
Surgery within last 3 months, number (%)	157 (22)	143 (23)

IQR, interquartile range.