Quotation Dexter, Franklin, Epstein, Richard, Elgart, Richard, Ledolter, Johannes. 2009. Forecasting and Perception of Average and Latest Hours Worked by On-Call Anesthesiologists. Anesthesia & Analgesia 109, 1246-1252.




BACKGROUND: We studied the value of providing information to anesthesia providers about the length of time typically worked during on-call shifts. The mean time at which a shift ends can be used for purposes of trades, payments, or reverse auctions, because the mean is proportional to the total time. The 80th percentile (with a suitable upper confidence limit for uncertainty due to limited sample sizes) can be used for judging the earliest time by which after-work activities reasonably can be planned. METHODS: (A) Three years of operating room (OR) information system data were analyzed. Dependent variables were the earliest times when the numbers of ORs running were always ≤6 ORs, ≤4 ORs, and ≤2 ORs. We progressively built linear regression models for each of the three dependent variables using day of the week, scheduled number of cases, scheduled hours of cases (including turnovers), and linear time trend. Calculations were repeated after excluding residuals. Calculations were repeated using regression trees. (B) Anesthesiologists were surveyed about their perceptions of the mean and 80th percentiles. RESULTS: (A) For the three thresholds and two end points (mean and 80th percentile), differences among days of the week were as large as 45 min. Differences between end points for the same weekdays were as large as 245 min. Comparatively, additional knowledge about the number or hours of cases provided in the late afternoon on the working day before surgery reduced the mean absolute error by only 4.1-6.0 min. Results were insensitive to a variety of analytic methods. Information available more days before the day of surgery (e.g., 1 wk) would have had even less incremental predictive value. (B) The mean absolute error of anesthesiologists┬┤ estimates for 80th percentiles was 60 min, principally because of underestimation of the 80th percentiles.


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Status of publication Published
Affiliation WU
Type of publication Journal article
Journal Anesthesia & Analgesia
Citation Index SCI
Language English
Title Forecasting and Perception of Average and Latest Hours Worked by On-Call Anesthesiologists
Volume 109
Year 2009
Page from 1246
Page to 1252
URL http://www.anesthesia-analgesia.org/cgi/content/abstract/109/4/1246
DOI https://doi.org/10.1213/ane.0b013e3181b0ffcc


Ledolter, Johannes (Former researcher)
Dexter, Franklin
Elgart, Richard
Epstein, Richard
Institute for Statistics and Mathematics IN (Details)
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