Table 1

Characteristics of the included studies
(a). Characteristics of the studies included for maternal genotype analysis
Author Year Country Populations PPROM Excluded? PTB cases group criteria Case sample size Control group criteria Control sample size
Women of European descent
Annells et al 2004 Australia White No GA<35 202 GA≥37 185
Hartel et al 2004 Germany White No GA<37 and VLBW 365 GA≥37 281
Hollegaard et al 2008 Denmark White No GA<37 62 GA≥37 55
Menon et al 2005 TN & PA, USA White No GA<36 101 GA≥37 326
Simhan et al 2003 PA. USA White Yes GA<34 39 GA≥37 110
Stonek et al 2008 Austria White No GA<34 21 GA≥37 1367
Heterogeneous population
Gomez et al 2010 PA, USA African American, and others No GA<37 60 GA≥37 636
Harper et al 2011 USA White, African American, Asian, and Others No GA<28 33 GA≥37 549
Moura et al 2009 Brazil Mulatto No GA<37 111 GA≥37 94
Moura et al 2009 Brazil Mulatto and White No GA<37 80 GA≥37 101
Simhan et al 2003 PA. USA African American Yes GA<34 12 GA≥37 46
Speer et al 2006 IL, USA White, African American, and Others No GA<35 79 GA≥37 80
(b). Characteristics of the studies included for fetal genotype analysis
Women of European descent
Hartel et al 2004 Germany White No GA<37 and VLBW 606 GA≥37 491
Heterogeneous population
Pereyra et al 2012 Uruguay Uruguayan No GA<37 53 GA≥37 56
Speer et al 2006 IL, USA White, African American, and Others No GA<35 78 GA≥37 78
Velez et al 2007 TN & PA, USA African American Yes GA<36 48 GA≥37 257

Wu et al.

Wu et al. BMC Genetics 2013 14:30   doi:10.1186/1471-2156-14-30

Open Data