Table V.
NTD GG allele frequency of previously published studies by FA fortification policy in each country of origin at the time of enrollment.
| Author (year) | Country of origin | FA fortification policy at time of enrollment | NTD GG allele frequency | Studies by FA fortification policy | p-value |
|---|---|---|---|---|---|
| De Marco et al. (2003) | Italy | Voluntary* | 0.32 (46/144) | 0.301 (185/614) | |
|
|
|||||
| Relton et al. (2004) | United Kingdom | Voluntary* | 0.33 (67/206) | ||
|
|
|||||
| O’Leary (2006) | Ireland | Voluntary* | 0.27 (72/264) | ||
|
|
0.0468 | ||||
| Shaw et al. (2002) | United States | No fortification | 0.28 (37/132) | 0.365 (119/326) | |
|
|
|||||
| Pei et al. (2014) | China | No fortification† | 0.45 (44/98) | ||
|
|
|||||
| Findley et al. (2017) | United States | No fortification | 0.40 (38/96) | ||
*
From Flynn A et al., 2009.
†
From Ren A, 2015.