| Table 3 |
| Transplant and Mortality Rates Among Waitlist Patients |
| Patients on the waitlist between 01/01/2001 and 12/31/2002 |
| Center: University of Maryland Medical System |
| Organ: KP: Kidney/Pancreas |
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Geographic Summaries, |
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This Center |
|
01/01/2002-12/31/2002 |
| |
Waitlist Registrations |
01/01/2001-12/31/2001 |
01/01/2002-12/31/2002 |
|
Region |
U.S. |
|
Sample |
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Count on waitlist at start |
94 |
87 |
|
455 |
2,488 |
| |
|
Person Years * |
98.6 |
84.4 |
|
466.9 |
2,528.0 |
|
Transplant Rate (deceased donor only) | |
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|
Removals for transplant |
35 |
17 |
|
126 |
1,011 |
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Transplant rate (per year on waitlist) |
0.36 |
0.20 |
|
0.27 |
0.40 |
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Expected Transplant Rate** |
0.39 |
0.37 |
|
0.40 |
0.40 |
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Ratio of Observed to Expected Transplants |
0.91 |
0.54 |
|
0.68 |
1.00 |
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95% Confidence Interval: Lower Bound † |
0.63 |
0.32 |
|
NA |
NA |
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Upper Bound † |
1.26 |
0.87 |
|
NA |
NA |
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p-value (2-sided) †† |
0.636 |
0.008 |
|
NA |
NA |
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How do the rates at this
center compare to those in the nation? |
Not
Significantly Different (a) |
Statistically
Lower (b) |
|
NA |
NA |
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Mortality while still on waitlist |
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Removals for death |
12 |
12 |
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34 |
209 |
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Death rate (per year on waitlist) |
0.12 |
0.14 |
|
0.07 |
0.08 |
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Expected Death Rate*** |
0.09 |
0.08 |
|
0.08 |
0.08 |
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Ratio of Observed to Expected Deaths |
1.40 |
1.72 |
|
0.86 |
1.00 |
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95% Confidence Interval: Lower Bound † |
0.72 |
0.89 |
|
NA |
NA |
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Upper Bound † |
2.44 |
3.00 |
|
NA |
NA |
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p-value (2-sided) †† |
0.320 |
0.105 |
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NA |
NA |
| |
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How do the rates at this
center compare to those in the nation? |
Not
Significantly Different (a) |
Not
Significantly Different (a) |
|
NA |
NA |
NA=Not Applicable.
† The 95% confidence interval gives a range of values for the true ratio of events (transplants or deaths) at the facility to those expected based on the
national experience. The true ratio
will be between this lower and upper bound 95% of the time.
†† A p-value gives the probability
that a difference between observed and expected is due to random chance. A p-value of <.05 is usually considered
statistically significant. |
(a) This difference could plausibly be
just a chance occurrence.
(b) This difference is unlikely due to random chance and probably represents
a real difference from the expected rate. |
| * Person years are calculated as days
(converted to fractional years). The
number of days from January 1 or from the date of first wait listing until
removal from the wait list or the end of one year. |
| ** The expected transplant rate is adjusted for age,
blood type, time on the waiting list, and previous transplantation. |
| *** The expected mortality rate is adjusted for age,
race, ethnicity, gender, primary diagnosis, time on the waiting list, and
blood type. |
| Based on data available as of 04/30/2003. Release at www.ustransplant.org on
07/09/2003. |
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