The following is the abstract of a paper (Majumdar et al., 2006):
Objectives To determine whether statins reduce mortality or need for admission to intensive care in patients admitted to hospital with community acquired pneumonia; and to assess whether previously reported improvements in sepsis related outcomes were a result of the healthy user effect.
Design Population based prospective cohort study.
Setting Six hospitals in Capital Health, Edmonton, Alberta, Canada.
Participants Adults admitted to hospital with pneumonia and categorised according to use of statins for at least one week before admission and during hospital stay.
Main outcome measures Composite of in-hospital mortality or admission to an intensive care unit.
Results Of 3415 patients with pneumonia admitted to hospital, 624 (18%) died or were admitted to an intensive care unit. Statin users were less likely to die or be admitted to an intensive care unit than non-users (50/325 (15%) v 574/3090 (19%), odds ratio 0.80, P=0.15). After more complete adjustment for confounding, however, the odds ratios changed from potential benefit (0.78, adjusted for age and sex) to potential harm (1.10, fully adjusted including propensity scores, 95% confidence interval 0.76 to 1.60).
Conclusions Statins are not associated with reduced mortality or need for admission to an intensive care unit in patients with pneumonia; reports of benefit in the setting of sepsis may be a result of confounding.
Majumdar SR, McAlister FA, Eurich DT, Padwal RS, Marrie TJ. (2006) Statins and outcomes in patients admitted to hospital with community acquired pneumonia: population based prospective cohort study. British Medical Journal 333, 999-1001.
1. What is meant by "odds ratio 0.80" and how was it calculated?
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2. What is meant by "P=0.15" and what can we conclude from it?
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3. What method could be used to calculate "P=0.15" and why?
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