Table 3.

Venous Thromboembolism (VTE) Prophylaxis Regimen Characteristics for Cases and Cohort Members

VTE Prophylaxis Regimen Characteristic	VTE Cases (total n=200)	Cohort Members (total n=370)	P-value
Chemoprophylaxis only, n (%)	52 (26)	71 (19)	0.059†
Median (IQR) duration, days	7(3, 17)	8(3, 14)	0.59‡
Median (IQR) percentage of time at risk, %	49 (19, 86)	10 (4, 23)	0.0001‡
Start of prophylaxis, n (%)			0.72†
On day of admission	18(35)	28 (39)
1–2 days after admission	28 (54)	33 (46)
≥3 days after admission	6(12)	10(14)
Mechanical prophylaxis only, n (%)	35(18)	39(11)	0.018†
Median (IQR) duration, days	8(4, 15)	5 (3, 9)	0.042‡
Median (IQR) percentage of time at risk, %	94(50, 100)	7(3, 10)	<0.0001‡
Start of prophylaxis, n (%)			0.93†
On day of admission	28 (80)	31 (79)
1–2 days after admission	5(14)	5(13)
≥3 days after admission	2(6)	3(8)
Chemoprophylaxis and mechanical prophylaxis, n (%)	51 (26)	74 (20)	0.130†
Median (IQR) duration, days	11 (8, 19)	12 (8, 24)	0.61‡
Median (IQR) percentage of time at risk, %	65(27, 100)	14 (9, 30)	<0.0001‡
start of prophylaxis, n (%)			0.58†
On day of admission	41 (80)	55 (74)
1–2 days after admission	8(16)	17(23)
≥3 days after admission	2 94)	2(3)

^†Chi-square test

^‡Wilcoxon rank sum test