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. Author manuscript; available in PMC: 2016 May 1.
Published in final edited form as: Ann Epidemiol. 2015 Feb 7;25(5):305–311. doi: 10.1016/j.annepidem.2015.01.016

Table 1.

An illustration: the association between genetic factors and cognitive ability in two populations*

99% Of children in nurturing educational environment
RR 338.95
RD 0.20
PARP 1.00
CA+ CA− Total
GE+ 303 1214 1517
GE− 5 8480 8485
Total 308 9694 10,002
20% Of children in nurturing educational environment
RR 1.68
RD 0.00
PARP 0.40
CA+ CA− Total
GE+ 6 1511 1517
GE− 20 8465 8485
Total 26 9976 10,002
*

In population 1, 99% of children are exposed to a nurturing educational environment. In population 2, 20% of children are exposed to a nurturing educational environment.