International Journal for Quality in Health Care 15:5-06 (2003)
© 2003 International Society for Quality in Health Care
Counterpoint |
Risk-adjusted sequential probability ratio tests and longitudinal surveillance methods
Northeastern University, Boston, MA, USA
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Use of statistical process control in health care
Statistical methods can play an important role in detecting changes in many hospital processes, including mortality and adverse event rates. Several surveillance methods have an established history of use within health care, while others such as standard and modified statistical process control (SPC) are experiencing growing interest. The retrospective use of SPC by Spiegelhalter et al. [1] is an excellent example of the potential role that risk-adjusted control charts could have played in earlier detection of higher mortality rates in the Bristol Royal Infirmary and of general practitioner Harold Shipman.
Statistical control charts were first developed in the 1920s by Walter Shewhart at Bell Laboratories [2], popularized by physicist and statistician W. Edwards
Special-purpose control charts and statistical issues
Risk-adjustment
Chart sensitivity
Rare events
Other statistical issues
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