表 2. Comparison of coagulation parameters between VTE and non-VTE groups before and after surgery.

VTE与非VTE患者术前后凝血指标比较

Parameter	Time point	Non-VTE (n = 265)	t 1	P 1 *	VTE (n = 42)	t 2	P 2 †	t 3	P 3 ‡
PT: prothrombin time; APTT: activated partial thromboplastin time; TT: thrombin time; FIB: fibrinogen; PLT: platelet count; HGB: hemoglobin; Pre-op: preoperative; Post-op: postoperative. * represents paired t-test within the non-VTE group (Pre-op vs. Post-op); † represents paired t-test within the VTE group (Pre-op vs. Post-op); ‡ represents independent-samples t-test between groups (for the Pre-op rows, pre-op values are compared between groups; for the Post-op rows, post-op values are compared between groups).
PT/s	Pre-op	11.04 ± 0.73	－7.476	< 0.001	10.86 ± 0.52	－6.519	< 0.001	1.524	0.129
	Post-op	11.51 ± 0.92			11.50 ± 0.63			0.116	0.908
APTT/s	Pre-op	27.16 ± 2.24	－2.023	0.044	26.53 ± 2.09	－1.845	0.072	1.709	0.089
	Post-op	27.52 ± 2.61			27.33 ± 2.64			0.421	0.674
TT/s	Pre-op	16.70 ± 8.44	3.163	0.002	16.51 ± 1.08	7.218	< 0.001	0.145	0.885
	Post-op	15.04 ± 1.25			15.29 ± 0.97			－1.222	0.223
FIB/(g/L)	Pre-op	3.04 ± 1.49	－8.363	< 0.001	3.25 ± 0.96	－10.385	< 0.001	－0.860	0.390
	Post-op	4.03 ± 1.27			4.54 ± 1.41			－2.399	0.017
D-dimer/(mg/L)	Pre-op	0.63 ± 1.73	－5.955	< 0.001	0.61 ± 0.72	－3.290	0.002	0.068	0.946
	Post-op	1.40 ± 1.78			3.34 ± 5.41			－4.528	< 0.001
PLT/(× 109 L-1)	Pre-op	230.69 ± 77.38	5.397	< 0.001	215.60 ± 41.72	2.561	0.014	1.235	0.218
	Post-op	212.25 ± 71.14			202.14 ± 47.30			0.889	0.375
HGB/(g/L)	Pre-op	127.54 ± 17.97	15.200	< 0.001	125.38 ± 15.72	7.986	< 0.001	0.735	0.463
	Post-op	115.68 ± 15.60			111.24 ± 13.13			1.747	0.082