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Sample size of biological mothers and fathers across all sweeps in the Millennium Cohort Study
| Parent | Sweep 1 (9 months) | Sweep 2 (3 years) | Sweep 3 (5 years) | Sweep 4 (7 years) |
|---|---|---|---|---|
| N | N | N | N | |
| Mothers | 18,497 | 14,645 | 12,792 | 12,175 |
| Fathers | 12,882 | 11,253 | 9710 | 8803 |
