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QuEST Mental Health Data for Improvement Network SPC Charts Alison Redpath Senior Information Analyst

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Statistical Process Control (SPC)

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Run Chart vs SPC Run ChartSPC Displays data as a picture that shows variation over time Simple rules make it easy to spot and interpret patterns (and not over interpret) Shows signals of change Is more sensitive and shows special causes of variation Enables you to see the individual data points and the average at the same time Shows the natural range, useful in planning Needs small amount of dataNeed data points as a minimum One way to createMany different types exist

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Which chart? What type of data? Can both occurrences and non-occurrences be counted? How many observations per sub- group? Continuous Discrete Are the sub- groups equal size? Are there equal areas of opportunity? XbarR chart XbarS chart XmR chart u-chart c-chart p-chart np-chart >10 Yes No Yes No Yes No

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Which chart? What type of data? Do we have both pass/fail, yes/no? How many are represented by one data point? MeasureCount Do all data points represent the same number? Is the chance the same for each point? XbarR chart XbarS chart XmR chart u-chart c-chart p-chart np-chart >10 Yes No Yes No Yes No

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Mental Health likely charts Waiting times breachers per month % p-chart DNA % - p-chart New:follow-up ratio per month p-chart Number of referrals per month c-chart Number of patients on the caseload per month c-chart Total waiting list size c-chart Average waiting time per month XbarR chart Average waiting time per day XbarS chart Waiting time per patient XmR chart

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Method

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Equations https://www.moresteam.com/toolbox/statistical-process-control-spc.cfm

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Theory

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Rules for interpretation Any point outside the control limits 2/3 points in the outer third 15 consecutive points in the inner third 8 or more above or below the average 6 or more in a trend

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Example Number of Adult Psychiatry Appointments DNA'd in NHS Somewhere between January 2011 and January 2013

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Example

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Further information has a list of different control chart types, with links to how to construct each of them Register with IHI.org and then find the webex On Demand: Using Run and Control Charts to Understand Variation

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Further support Alison Redpath Senior Information Analyst QuEST Mental Health

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