Table 1.

Intensive care unit (ICU) mortality attributable to clinically important gastrointestinal bleeding

ICU mortality	Relative risk (95% confidence interval)	Absolute risk (95% confidence interval)
Crude comparison	2.2 (1.6–2.9)	24.0 (11.3–36.6)
Matched cohort method	2.9 (1.6–5.5)	30.3 (15.2–45.3)
Model-based matched cohort method	1.8 (1.1–2.9)	20.3 (4.3–36.4)
Regression method	4.1 (2.6–6.5)	-
Adjusted*	1.0 (0.6–1.7)	-

The model-based matched cohort probably yields the best estimate of the attributable mortality. See Table 3 for advantages and disadvantages of these methods. ^* Adjusted for age, APACHE II score, admitting diagnosis, duration of ventilation, Multiple Organ Dysfunction Score, and bleeding status.