CHAPTER 27 • Statistical Process Control

27-8 CHAPTER 27 • Statistical Process Control
DRG
Percent of losses
104 5.2
107 10.1
109 7.7
116 13.7
148 6.8
209 15.2
403 5.6
430 6.8
462 9.4
What percent of total losses do these 9 DRGs account for? Make a Pareto chart of
losses by DRG. Which DRGs should the hospital study first when attempting to
reduce its losses? DRG
27.5 Pareto charts. Continue the study of the process of getting to work or class on
time from Exercise 27.2. If you kept good records, you could make a Pareto chart
of the reasons (special causes) for late arrivals at work or class. Make a Pareto chart
that you think roughly describes your own reasons for lateness. That is, list the
reasons from your experience and chart your estimates of the percent of late arrivals
each reason explains.
27.6 Pareto charts. A large hospital was concerned about whether it was scheduling
its operating rooms efficiently. Operating rooms lying idle may mean loss of potential
revenue. Of particular interest was when and for how long the first operation
of the day was performed. As a first step in understanding the use of its operating
rooms, data were collected on what medical specialties were the first to use one of
the rooms for an operation in the morning. 5 Here is what the hospital found:
Specialty
Percent of all operations
Burns Center 3.7
ENT specialist 7.6
Gynecology 5.9
Opthalmology 7.2
Orthopedics 12.3
Plastic surgery 21.1
Surgery 30.6
Urology 7.2
What percent of total operations do these 8 specialties account for? Make a Pareto
chart of percent of all operations by specialty. Which specialties should the hospital
study first when attempting to understand operating-room use? OPERATIONS