Table 3 IRs of hospitalisation for VTE^a per 1000 person-years in the cancer cohort (n=40 994) and aRRs^b of hospitalisation for venous thromboembolism in the cancer cohort compared with the general-population (n=204 970) (DCR, 1997–2003)^c

Characteristic	N	IR (95% CI)	aRR ^b (95% CI)
Cancer stage ^c
Stage I	1240	44 (2.7–7.1)	2.9 (1.5–5.5)
Stage II	14520	44.9 (4.0–5.7)	2.9 (2.4–3.5)
Stage III	10499	11.1 (9.7–12.7)	7.5 (6.0–9.4)
Stage IV	9125	27.7 (243.0–32.0)	17.1 (12.6–23.3)
Unspecified	5610	12.2 (10.1–14.8)	5.6 (4.1–7.5)
Treatment ^c,d
No/symptomatic	8565	20.8 (17.3–25.0)	8.4 (6.2–11.4)
Chemotherapy only	3026	23.1 (19.0–28.1)	18.5 (11.9–28.7)
Radiation only	2512	10.1 (7.2–14.1)	8.9 (5.0–16.0)
Surgery only	16564	6.5 (5.7–7.3)	3.2 (2.7- 3.8)
Other^e	781	13.4 (7.6–23.7)	6.0 (2.3–15.6)
Combination therapy	8625	8.5 (7.3–9.9)	8.6 (6.7–11.1)
Unspecified	921	9.2 (4.8–17.6)	5.8 (2.1–16.6)
Treatment including ^c
No/symptomatic	8565	20.8 (17.3–25.0)	8.4 (6.2–11.4)
Chemotherapy	7154	14.0 (12.2–16.2)	16.2 (12.0–21.7)
Radiation	6943	8.2 (6.8–9.9)	7.9 (5.8–10.7)
Surgery	24525	7.0 (6.3–7.7)	4.1 (3.6- 4.7)
Other^e	781	13.4 (7.6–23.7)	6.0 (2.3–15.6)
Unspecified	921	9.2 (4.8–17.6)	5.8 (2.1–16.6)

Abbreviations: aRR=adjusted relative risk; CI=confidence interval; DCR=Danish Cancer Registry; IR=incidence rate; VTE=venous thromboembolism.
Please see Supplementary Information for IR and RR by time since diagnosis/index date.
^aWe excluded VTEs that occurred in the year before diagnosis/ index date.
^bAdjusted for age, sex, myocardial infarction, congestive heart failure, peripheral vascular disease, chronic obstructive pulmonary disease, inflammatory bowel disease, peptic ulcer disease, liver disease, renal disease, diabetes, obesity, acute pancreatitis, alcoholism and hypertension when the number of VTE events for a given comorbidity was sufficient.
^cTo obtain data on cancer stage and treatment, analyses are based on cancer patients in the DCR and their matched members of the general-population cohort.
Mutually–exclusive treatment categories
^eOthers describe treatment other than chemotherapy, radiation and/or surgery. This includes cryocoagulation, anti-hormone therapy and other treatments not further specified.

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