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. Author manuscript; available in PMC: 2014 Jun 4.
Published in final edited form as: Twin Res Hum Genet. 2012 Oct 9;16(1):449–450. doi: 10.1017/thg.2012.64

Table 1.

Date of Birth (DOB) and Dates of Tests for Each Birth Cohort

2001 Cohort 2002 Cohort 2003 Cohort 2004 Cohort
DOB 07/2001 – 12/2001 02/2002 – 12/2002 01/2003 – 12/2003 01/2004 – 09/2004
N pairs Age 2/Age3 49/49 103/97 99/97 63/61
Age 2 Test Dates 07/2003 – 01/2004 02/2004 – 02/2005 02/2005 – 01/2006 01/2006 – 11/2006
Age 3 Test Dates 07/2004 – 01/2005 02/2005 – 02/2006 02/2006 – 01/2007 01/2007 – 11/2007