Marilyn K Hart

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This article proposes a new class of control charts that may be used for monitoring and improving the quality of care. Unlike conventional control charts that rely on observed performance data, these charts use risk-adjusted data in addition to the observed data. The resulting time-ordered charts are capable of reducing time-to-time variation that may stem(More)
STUDY OBJECTIVE To compare the effectiveness and adverse effects of air-fluidized beds and conventional therapy for patients with pressure sores. DESIGN Randomized trial with both masked and unmasked comparisons of outcome after a median follow-up of 13 days (range, 4 to 77 days). SETTING Urban, academic referral, and primary care medical center. (More)
In a previous article (M. K. Hart, Qual Manag Health Care. 2003;12(1):5-19), the authors presented risk-adjusted control charts applicable for attributes data. The present article discusses a similar class of control charts applicable for variables data that are often skewed. The key feature of these charts is their application of risk-adjusted data in(More)
The p chart is widely used in health care and other service organizations as well as in manufacturing to monitor the proportion of observations with some particular characteristic for comparing several sources of data or for tracking a single source of data over time. The conventional approach is to use 3sigma limits found by using the normal approximation(More)
In previous articles [M.K. Hart, Qual Manage Health Care. 2004;13(2):99-119 and 2003;12(1):5-19], the author presented control charts applicable for risk-adjusted, time-ordered variables and attribute data. The present article uses Shewhart X and s charts with risk-adjusted variables data to compare length-of-stay data from several healthcare organizations.(More)
This study was undertaken as an interdisciplinary effort in response to a frequently frustrating clinical problem of interpreting variable blood pressure measurements under uncertain conditions of quality control. The method is an application of the Shewhart Control Chart analysis to blood pressure measurement in adults in an academic nursing center. The(More)
The health care industry is slowly embracing the use of statistical process control (SPC) to monitor and study causes of variation in health care processes. While the statistics and principles underlying the use of SPC are relatively straightforward, there is a need to be cognizant of the perils that await the user who is not well versed in the key concepts(More)
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