1.  Statistical process control chart for adverse drug events (ADEs) per 1000 doses of medication dispensed during the entire period of audit from January 2001 until December 2003.
 Statistical process control chart for adverse drug events (ADEs) per 1000 doses of medication dispensed during the entire period of audit from January 2001 until December The solid line represents the mean ADE rate and the dotted line represents the upper control limit, defined as three standard deviations above the mean. Each point represents the result of a singe month’s audit.
M M Cohen et al. Qual Saf Health Care 2005;14:
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