Included Studies | Location | Observational Period | Participants | Number of Centers | Timing of Thyroid Function Testing | Laboratory Validation |
Casey, 2005 | USA | Apr. 2000-Apr. 2003 | 25,765 | Single | <20 weeks | FT4, TSH |
Casey, 2006 | USA | Nov. 2000-Apr. 2003 | 25,765 | Single | <20 weeks | FT4, TSH |
Cleary-Goldman, 2008 | USA | Oct. 1999-Dec. 2002 | 10,990 | Multiple | 1st & 2nd Trimesters | FT4, TSH TPO-Ab, TG-Ab |
Wikner, 2008 | Sweden | Jul. 1995-Dec. 2004 | 848,468 | Multiple | <13 weeks | No |
Mannisto, 2009 | Finland | Jul. 1985-Jun.1986 | 9247 | Multiple | <20 weeks | FT3, FT4, TSH TPO-Ab, TG-Ab |
Luewan, 2011 | Thailand | Jan. 1994-Dec. 2008 | 540 | Single | All trimesters | FT4, TSH |
Su, 2011 | China | Oct. 2008-Dec. 2010 | 1017 | Multiple | <20 weeks | FT4, TSH |
Chen, 2011 | Taiwan | Jan.-Dec. 2005 | 16,980 | Multiple | Medical record | No |
Wang, 2012 | China | 2007-2009 | 756 | Multiple | <12 weeks | FT3, FT4, TSH |
Mannisto, 2013 | USA | 2002-2008 | 223,512 | Multiple | Medical record | No |
Chen, 2014 | China | Feb. 2009-Feb. 2012 | 8012 | Single | All trimesters | FT4, TSH |