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Control Charts and Injury/Illness Analysis

Control Charts and Injury/Illness Analysis. Presentation to the spring 2008 UW System Safety and Loss Prevention meeting, River Falls, WI. Overview. What are we analyzing? What is missed? Control chart review Data for monthly employment Questions for you What is useful? What is not?

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Control Charts and Injury/Illness Analysis

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  1. Control Charts and Injury/Illness Analysis Presentation to the spring 2008 UW System Safety and Loss Prevention meeting, River Falls, WI

  2. Overview • What are we analyzing? What is missed? • Control chart review • Data for monthly employment • Questions for you • What is useful? What is not? • What else might be useful?

  3. What are we looking at?

  4. What are we looking at? • Lagging indicator • Retrospective, little predictive value • Only those events that are reported and recorded • Currently have no data to suggest how much is unreported • Tracking failures, implies loss avoidance • However, it is one of the baseline measures of outcomes

  5. Overview • What are we analyzing? What is missed? • Control chart review • Data for monthly employment • Questions for you • What is useful? What is not? • What else might be useful?

  6. Control Chart ReviewUsing historic program data • Monthly data (roughly even sample sizes) • Suggested minimum number of months, 25 to 60 • For most campuses, the monthly count of lost workday cases will be too low to yield meaningful results—use all recordable incidents • Run chart

  7. Historical dataGraphical record of incidents

  8. Control limits • Derived from the average of the baseline data • Typically set at ± 3 standard deviations • Data point outside of this is highly unlikely to be result of random variation • There should be an assignable cause

  9. Creating the control chartAdd the average and ±3 standard deviation

  10. Out of control data • Data outside of control limits • Other out of control trends • Effect on setting the baseline

  11. Out of control data • Definition of a trend for control charts • 1 point outside the control limits • 2 out of 3 points two standard deviations above/ below average • 4 out of 5 points one standard deviation above/below average • 7 points in a row all increasing/decreasing • 7 points in a row all above/below average • 10 out of 11 points in a row all above/below average

  12. Expected vs. unexpected data

  13. Overview • What are we analyzing? What is missed? • Control chart review • Data for monthly employment • Questions for you • What is useful? What is not? • What else might be useful?

  14. What about seasonal employment variations?

  15. What about seasonal employment variations?

  16. What about seasonal employment variations?

  17. Adjusting for variable sample size

  18. Overview • What are we analyzing? What is missed? • Control chart review • Data for monthly employment • Questions for you • What is useful? What is not? • What else might be useful?

  19. Plan for OSLP action, FY09Injury/Illness Analysis • Listen to your ideas for what we should look at • At your campus • Across UW System campuses • Comparison to others

  20. Plan for OSLP action, FY09Injury/Illness Analysis • Listen to your ideas for what we should look at • Prioritize • Long-term, on-going metric • Short-term, hot topics

  21. Plan for OSLP action, FY09Injury/Illness Analysis • Listen to your ideas for what we should look at • Prioritize • Each month, develop one new data aspect • Finalize STARS report format to update system-wide C-chart on quarterly basis. • Look at age vs. incident rate. • Look at causes for summer vs. academic year.

  22. Plan for OSLP action, FY09Injury/Illness Analysis • Listen to your ideas for what we should look at • Prioritize • Each month, develop one new data aspect • Report to campuses every 4 months on findings • For up to one year • Revisit usefulness May ‘09

  23. Resources • http://www.uwsa.edu/oslp/safety/uwsres/presentations.htm • http://www.hanford.gov/safety/vpp/vppage.htm • Safety Metrics: Tools and Techniques for Measuring Safety Performance, Christopher Janicak, 2003, Government Institutes • Accident Prevention Manual for Business and Industry: Administration and Programs, Krieger and Montgomery, 1997, National Safety Council • Quality Control and Industrial Statistics, 4th Ed., Acheson Duncan, 1974, Richard D. Irwin, Inc.

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