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. Author manuscript; available in PMC: 2011 Mar 1.
Published in final edited form as: Ann Epidemiol. 2010 Jan 6;20(3):241–249. doi: 10.1016/j.annepidem.2009.10.009

Table 5.

Number and Percentage of Cases and Controls Missing Paternal Age, Categorized by Maternal Age, National Birth Defects Prevention Study 1997–2004.

Maternal age Case Control
N % N %
21 and under 264 8.4 100 8.8
22–26 133 3.5 60 4.2
27–30 72 2.2 16 1.2
31–33 32 1.3 15 1.6
34 and over 85 2.8 17 1.6
Total 586 3.7 208 3.6