Table 4.

Mortality rate ratios in patients with ulcerative colitis undergoing total colectomy in the period 1996–2010 in Denmark

	Emergency		Elective
	Crude	Adjacent	Crude	Adjacent
Females	Ref.	Ref.	Ref.	Ref.
Males	1.15 (0.68–1.97)	1.16 (0.68–1.98)	0.94 (0.23–3.74)	0.79 (0.20–3.19)
Age at operation
0–39 years	Ref	Ref	Ref	Ref
≥40 years	26.18 (11.2–61.1)	17.78 (7.3–43.1)	24.65 (3.0–200)	24.51 (2.81–213.8)
Number of annual colectomies for IBD performed by the surgical department
≤3/year	Ref.	Ref.	Ref.	Ref.
3–12/year	0.51 (0.24–1.06)	0.58 (0.28–1.23)	1.18 (0.20–7.08)	1.51 (0.25–9.18)
>12/year	0.30 (0.17–0.55)	0.46 (0.25–0.84)	0.30 (0.05–1.82)	0.63 (0.10–3.89)
Duration of hospitalisation before colectomy
Admitted <8 days before colectomy	Ref.	Ref.	Ref.	Ref.
Admitted ≥8 days before colectomy	0.62 (0.36–1.06)	0.67 (0.39–1.16)	10.30 (1.27–83.6)	10.26 (1.25–84.2)
Charlson comorbidity index score
0	Ref.	Ref.	Ref.	Ref.
≥1	7.20 (4.10–12.65)	2.56 (1.42–4.61)	3.05 (0.76–12.2)	1.06 (0.25–4.46)
Time period
1996–2000	Ref.	Ref.	Ref.	Ref.
2001–2005	0.87 (0.48–1.60)	0.90 (0.49–1.64)	0.90 (0.06–14.31)	0.90 (0.06–14.54)
2005–2010	0.72 (0.36–1.43)	0.60 (0.30–1.20)	6.47 (0.78–53.7)	5.18 (0.62–43.6)

Adj, adjusted for age, gender and comorbidity.

IBD, inflammatory bowel disease.