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. Author manuscript; available in PMC: 2019 Aug 20.
Published in final edited form as: Birth Defects Res. 2018 Nov 5;110(19):1395–1403. doi: 10.1002/bdr2.1400

TABLE 2.

Demographic variables with percentage of data missing by site

% data missing
Demographic variables Emory University Massachusetts New York
Age 0 0 0
Birth year 0 2.0 0
Gender 0 2.0 3.7
Race 32.1 48.0 19.8
Ethnicity 62.4 30.5 11.0
Height 69.4 91.6 100.0
Weight 87.5 90.8 90.5
Primary language 67.5 22.1 92.3
Marital status 28.2 96.6 87.0