Year | Number | # of low R. folate | % of low R.folate | Mean R. folate (nmol/L) |
---|
1996 | 511 | 95 | 18.5 | 509 |
1997 | 474 | 56 | 11.5 | 588 |
1998 | 581 | 17 | 4.5 | 858 |
1999-01 | 991 | 19 | 1.9 | 947 |
2002-04 | 34 | 1 | 2.9 | 831 |
- The difference between the mean, number or percentage of low red cell folates in 1996 and 1997 is significant (P < 0.01), between those of 1997 and 1998 is also significant (P < 0.001), but the differences between those of 1998, 1999-2001 and 2002-2004 are not significant, based on Chi square calculation and t-test(By January first 1998 almost all of grain products in Canada were fortified with folic acid).