A twin study of cognitive costs of low birth weight and catch-up growth.
OBJECTIVE
To investigate whether there is an association between catch-up growth and cognitive performance in humans.


METHODS
Catch-up growth was defined as the change in weight standard deviation scores during the first 2 years of life. Cognitive performance was assessed with psychometric IQ tests, administered at ages 12 and 18 years. Data were collected in twin pairs, and analyses were carried out within pairs.


RESULTS
There was a significant negative association between catch-up growth and IQ at both ages 12 and 18 years.


CONCLUSIONS
A larger gain in weight during the first 2 years of life is associated with a lower IQ. However, catch-up growth is correlated with birth weight and this correlation may explain part of the association.
Estourgie-van Burk
G Frederiek
GF
Department of Pediatric Endocrinology, VU University Medical Center, Amsterdam, The Netherlands. f.estourgie@vumc.nl
Bartels
Meike
M
Hoekstra
Rosa A
RA
Polderman
Tinca J C
TJ
Delemarre-van de Waal
Henriette A
HA
Boomsma
Dorret I
DI