Median cumulative dose (total mg) of FA purchased by mothers for the 12-month period before birth, by calendar year for those that purchased, and excluding outliers, n=465 109
| Time period | Parity | N | Median (IQR) | P value |
| 2000–2005 | Nulliparous | 94 144 | 90 (40.5–210) | <0.001 |
| 1 | 53 284 | 75 (33–180) | ||
| 2 | 12 502 | 63 (30–150) | ||
| ≥3 | 3810 | 60 (30–147) | ||
| 2006–2016 | Nulliparous | 105 520 | 135 (60–270) | <0.001 |
| 1 | 95 913 | 96 (42–210) | ||
| 2 | 57 997 | 90 (36–192) | ||
| ≥3 | 41 939 | 75 (36–168) |