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Table 4 Catch-up and catch-down growth between birth and school entry

From: The growth of assisted reproductive treatment-conceived children from birth to 5 years: a national cohort study

  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
  1. Catch up/down is defined as a change of more than one decile in the standardised growth charts (between birth and primary school entry)
  2. P values are from a χ2 test comparing, separately, ART fresh with naturally conceived children and FET with naturally conceived children
  3. 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)