| | Naturally conceived | Fresh ART | Frozen ART (FET) |
|---|
n (%) | n (%) |
P
| n (%) |
P
|
|---|
All babies: catch-up | 2491/10500 (23.7%) | 559/2095 (26.7%) | 0.004 | 104/519 (20.0%) | 0.053 |
All babies: catch-down | 2834/10500 (27.0%) | 483/2095 (23.1%) | 0.002 | 155/519 (29.9%) | 0.15 |
Small babies: catch-up | 1237/2238 (55.3%) | 283/492 (57.5%) | 0.36 | 43/75 (57.3%) | 0.72 |
Large babies: catch-down | 1928/4015 (48.0%) | 306/711 (43.0%) | 0.014 | 116/240 (48.3%) | 0.92 |
- Catch up/down is defined as a change of more than one decile in the standardised growth charts (between birth and primary school entry)
- P values are from a χ2 test comparing, separately, ART fresh with naturally conceived children and FET with naturally conceived children
- Numbers and proportions are shown for all children experiencing catch-up (first row) and catch-down (second row) growth: then catch-up growth for those babies who were small at birth (defined here as 1st–3rd deciles - third row) and catch-down growth for those babies who were large at birth (defined here as 8th–10th deciles - fourth row)
