In the May 2009 supplement to the American Journal of Critical Care, “Fecal Containment in Bedridden Patients: Economic Impact of 2 Commercial Bowel Catheter Systems,” by Areta Kowal-Vern and colleagues (2009;18[3]: S2–S15), the following information should have been added to the last paragraph of the Procedures section on page S5:

A sample size of 67 subjects was required to determine a 25% difference between catheter A and catheter B (α = 0.05, β = 0.20, power is 0.80) when catheter B was not expected to exceed a 60% increase in linen change (less than 1 unscheduled change per day).

The sample size was based on an alpha correction to accommodate the planned interim analysis, and consists of a 10% increase to accommodate dropout.

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