Question

Sample A study in South Africa focusing on the impact
of health insurance identified 1590 children at birth and
then sought to conduct follow-up health studies 5 years
later. Only 416 of the original group participated in the
5-year follow-up study. This made researchers concerned
that the follow-up group might not accurately resemble
the total group in terms of health insurance. The table in the
next column summarizes the two groups by race and by
presence of medical insurance when the child was born.
Carefully explain how this study demonstrates Simpson’s
paradox. (Birth to Ten Study, Medical Research Council,
South Africa)

Number (%) Insured
Follow-Up
Not Traced
36 of 404
(8.9%)
Black
91 of 1048
(8.7%)
White
10 of 12
104 of 126
(83.3%)
(82.5%)
Overall
46 of 416
195 of 1174
(11.1%)
(16.6%)
Race
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Transcribed Image Text

Number (%) Insured Follow-Up Not Traced 36 of 404 (8.9%) Black 91 of 1048 (8.7%) White 10 of 12 104 of 126 (83.3%) (82.5%) Overall 46 of 416 195 of 1174 (11.1%) (16.6%) Race