Fig. 1From: Management of a cluster of Clostridium difficile infections among patients with osteoarticular infectionsIncidence of C. difficile infections during the study period. The CDI incidence rates (number of cases per 1000 hospital bed days per quarter) for the whole department of orthopedic surgery (diamonds) and the septic ward only (squares) are shown. For every quarter the moving average (MA) of the previous four quarters was calculated. For CDI surveillance upper (MA + SD, upper dotted line) and lower (MA-SD, lower dotted line) boundaries were defined. An increase or decrease of the CDI incidence was considered significant if the actual CDI incidence crossed the upper or lower boundaries, respectivelyBack to article page