TABLE 3.
Anemia and ID in 4 North American pregnant populations1
| Trimester, % (n) |
|||||
| Study, year (reference) | Iron status variable | 1 | 2 | 3 | Delivery, % (n) |
| NHANES (ages 12–49 y) | ID; SF <12 μg/L | 7.3 (189) | 23.7 (416) | 39.2 (384) | — |
| Mei et al., 2011 (12) | Anemia | 2.7 (189) | 2.2 (416) | 10.8 (384) | — |
| APrON2 (ages 16–40 y) | ID; SF <12 μg/L | 3 (286) | 10 (1020) | 40 (847) | — |
| Unpublished | Anemia | 2 (540) | 2 (1894) | 5 (1673) | — |
| Teens (ages 13–18 y) | ID; SF <12 μg/L | 6.5 (137) | 22.2 (99) | 34.8 (46) | 21.4 (206) |
| Lee et al., 2014 (50) | Anemia | — | 32.5 (123) | 42.3 (85) | 35 (228) |
| Multiples (ages 20–46 y) | ID; SF <12 μg/L | — | 37 (73) | — | 26.2 (61) |
| Ru et al., 2016 (58) | Anemia | — | 31.5 (73) | — | 42.6 (61) |
1
APrON, Alberta Pregnancy Outcomes and Nutrition Study; ID, iron deficiency; SF, serum ferritin.
2
Unpublished data from the APrON cohort were provided by R Bell and C Field (University of Alberta, Department of Agricultural, Food and Nutritional Science, personal communication, 2016).