Table 1.

Type of proximate medical conditions considered to predispose to VTE. Frequency and timing of the events in relation to the index date among the cases and controls.

	Number of cases (Mean time prior to index date)	Number of controls (Mean time prior to index date)
Risk factors
Lower limb fracture	7 (14 days)	0 (–)
Surgery	6 (17 days)	0 (–)
Cancer	1 (–)	2 (–)
Arthroscopy	5 (8 days)	0 (–)
Ankle injury	2 (12 days)	2 (30 days)
Invasive endoscopy	1 (10 days)	2 (10 days)
Other*	4 (–)	0 (–)
No risk factors	106	767
Total	132	773

^*Include one case of each of the following: cystic fibrosis, acute cholecystitis, severe pelvic sepsis and a stab wound that cut the jugular vein resulting in intensive care treatment.