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. Author manuscript; available in PMC: 2013 Jan 1.
Published in final edited form as: Epidemiology. 2012 Jan;23(1):151–158. doi: 10.1097/EDE.0b013e31823b539c

Table 1.

Self reported maternal smoking in the periconceptional period and oral facial cleft in the National Birth Defects Prevention Study, 1997–2003

Reported smoking Cases (n=1315) Controls (n=4848)
Yes 340 949
No 975 3899