表 1. Comparison of general characteristics between VTE and non-VTE groups.

VTE及非VTE患者一般情况比较

Characteristic	Non-VTE (n = 265)	VTE (n = 42)	t/χ 2	P
VTE: venous thromboembolism; BMI: body mass index; COPD: chronic obstructive pulmonary disease.
Age/yr.	45.77 ± 12.89	60.55 ± 12.59	－6.924	< 0.001
BMI/(kg/m2)	23.43 ± 3.17	24.49 ± 3.06	－2.021	0.044
Menopause/case (%)	90 (33.96)	18 (42.86)	21.155	< 0.001
Hypertension/case (%)	27 (10.19)	13 (30.95)	17.702	< 0.001
Diabetes mellitus/case (%)	26 (9.81)	4 (9.52)	0.251	0.618
COPD/case (%)	4 (1.5)	1 (2.38)	0.172	0.680
Smoking/case (%)	16 (6.04)	1 (2.38)	0.360	0.549
Hormone replacement therapy/case (%)	42 (15.85)	6 (14.29)	0.067	0.796
Caprini score	3.64 ± 1.11	4.57 ± 1.21	－4.958	< 0.001
Length-of-stay/d	7.50 ± 3.76	9.21 ± 5.09	－2.602	0.010