Questionnaires and Data Collection Instruments
1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2008 | 2010 | 2011 |
Round 1998 – 5-month-old infants (E1)
Round 1999 - 17-month-old children (E2)
Round 2000 - 29-month-old children (E3)
Round 2001 - 41-month-old children (E4)

Round 2002 - 45-to 56 month-old children (E5)

Round 2003 - 5-year-old children (E6)

Round 2004 - 6-year-old children (E7)

Round 2005- 7 year-old children (E8)

Round 2006- 8 year-old children (E9)

Round 2008-10 year-old children (E11)

Round 2010-12 year-old children (E13)

Round 2011-13 year-old children (E14)

* Unavailable due to copyright protection
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