1. Demographics and the Registry
Kate Morrissey

2. Study Question
 What is the percentage of population on the donor
registry among TOSA counties compared with the
rest of Texas?

3. Data
 2010 Census Data
 Texas Donor Registry (through July 31, 2014)

4. Legend
 TOSA Counties = DSA (Donor Service Area)
 ■ = Southern Region
 ▲ = Northern Region
 ● = Central Region
 Colors = Various levels of Demographic

6. 23.64% 23.26%
15.79%
0.00%
5.00%
10.00%
15.00%
20.00%
25.00%
Central North South
TOSA DSAs
% of Population on Donor Registry
DSA Average Lower 95% Upper 95%
Central 23.64% 20.52% 26.76%
North 23.26% 20.22% 26.29%
South 15.79% 12.76% 18.83%

8. 39.78%
25.91%
80.98%
0.00%
10.00%
20.00%
30.00%
40.00%
50.00%
60.00%
70.00%
80.00%
90.00%
Central North South
TOSA DSAs
% of Population Hispanic
DSA Average Lower 95% Upper 95%
Central 39.78% 32.32% 47.26%
North 25.91% 18.64% 33.18%
South 80.98% 73.71% 88.25%

10. $47,267.50 $46,481.30
$33,961.10
$0.00
$5,000.00
$10,000.00
$15,000.00
$20,000.00
$25,000.00
$30,000.00
$35,000.00
$40,000.00
$45,000.00
$50,000.00
Central North South
TOSA DSAs
Average Median Income
DSA Average Lower 95% Upper 95%
Central $47,267.50 $42,967.00 $51,568.00
North $46,481.30 $42,295.00 $50,667.00
South $33,961.10 $29,775.00 $38,147.00

12. 15.73% 15.62%
28.52%
0.00%
5.00%
10.00%
15.00%
20.00%
25.00%
30.00%
Central North South
%BelowPovertyLine
TOSA DSAs
Percent Below Poverty Line, All Ages
DSA Average Lower 95% Upper 95%
Central 15.73% 12.26% 19.21%
North 15.62% 12.24% 19.00%
South 28.52% 25.13% 31.90%

14. 2.60 2.57
3.14
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
Central North South
AverageHouseholdSize
TOSA DSAs
Average Household Size
DSA Average Lower 95% Upper 95%
Central 2.60 2.45 2.75
North 2.57 2.43 2.71
South 3.14 3.00 3.29

16. 42.08 41.38
34.42
0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
40.00
45.00
Central North South
TOSA DSAs
Average Median Age
DSA Average Lower 95% Upper 95%
Central 42.08 39.00 45.15
North 41.38 38.39 44.37
South 34.42 31.43 37.41

18. 78.26%
82.04%
62.81%
0.00%
10.00%
20.00%
30.00%
40.00%
50.00%
60.00%
70.00%
80.00%
90.00%
Central North South
TOSA DSAs
% of Population (25+) w/ at least a High School Diploma
DSA Average Lower 95% Upper 95%
Central 78.26% 74.78% 81.74%
North 82.04% 78.65% 85.42%
South 62.81% 59.42% 66.20%

20. 19.99%
21.98%
12.56%
0.00%
5.00%
10.00%
15.00%
20.00%
25.00%
Central North South
TOSA DSAs
% of Population (25+) w/ at least a Bachelor's Degree
DSA Average Lower 95% Upper 95%
Central 19.99% 16.63% 23.35%
North 21.98% 18.72% 25.25%
South 12.56% 9.29% 15.83%

21. The New Question
 After looking at the previous data, we can see that
TOSA has a very different demographic make up
than other OPOs.
 A new question is looked at:
 What are the odds of a Hispanic in the TOSA OPO being
on the donor registry?
 The odds of a Caucasian?

22. Data
 Case-Control Study
 9049 referrals between 2012 and first half of 2014
(18 months)
 Case: Registry referral
 Control: Non-Registry referral
 Variable of interest: Race/Ethnicity
 Hispanic/Latino vs. Non-Hispanic
 (Non-Hispanic) Caucasian vs. Non-Caucasian
 Data compiled by Todd Morefield and Eric Elliott

23. Odds Ratio
Outcome No
Outcome
Total
Variable A B A+B
No
Variable
C D C+D
Total A+C B+D A+B+C+
D
• An odds ratio is the probability of the outcome given
that the variable is present divided by the probability of
the outcome given that the variable is not present.
• OR =
𝐴𝐷
𝐵𝐶
• This can be calculated using a 2x2 table, shown below:

24. Odds Ratio Meaning
 Odds Ratio > 1 (Confidence Interval > 1)
 There is a positive association between the outcome and
the variable.
 Odds Ratio < 1 (Confidence Interval < 1)
 There is a negative association between the outcome and
the variable.
 Odds Ratio = 1 (Confidence Interval contains 1)
 There is no association between the outcome and the
variable.

25. Hispanics 2x2 Table
Registry Non-Registry Total
Hispanic 155 4498 4653
Non-Hispanic 408 3988 4396
Total 563 8486 9049

26. Odds Ratio
 OR =
𝐴𝐷
𝐵𝐶
=
(155)(3988)
(4498)(408)
= 0.337
 95% Confidence Interval = (0.279, 0.407)
 Interpretation:
 Hispanics in the TOSA counties are between
0.279 and 0.407 times less likely than Non-
Hispanics to be on the donor registry, on
average, with 95% confidence.
 This is a very low odds ratio. There is a
negative association between being Hispanic
and being on the donor registry.

27. Caucasians 2x2 Table
Registry Non-Registry Total
Caucasian 361 3171 3532
Non-Caucasian 202 5315 5517
Total 563 8486 9049

28. Odds Ratio
 OR =
𝐴𝐷
𝐵𝐶
=
(361)(5315)
(3171)(202)
= 2.995
 95% Confidence Interval = (2.508, 3.578)
 Interpretation:
 Non-Hispanic Caucasians in the TOSA
counties are between 2.508 and 3.578 times
more likely than Non-Caucasians to be on the
donor registry, on average, with 95%
confidence.
 This is a very high odds ratio. There is a
positive association between being Caucasian
and being on the donor registry.

29. Odds Ratios per TOSA DSA
TOSA DSA Odds Ratio Lower 95% Upper 95%
Central 0.440 0.333 0.531
North 0.521 0.365 0.744
South 0.311 0.182 0.531
Hispanics vs. Non-Hispanics

30. Odds Ratios per TOSA DSA
TOSA DSA Odds Ratio Lower 95% Upper 95%
Central 2.595 1.984 3.396
North 2.040 1.527 2.726
South 2.884 1.655 5.025
Caucasians vs. Non-
Caucasians