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Birth characteristics and different dimensions of intellectual performance in young males: a nationwide population-based study
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Women's and Children's Health. (Barnendokrinologisk forskning/Tuvemo)
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Women's and Children's Health. (Barnendokrinologisk forskning/Tuvemo)
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Women's and Children's Health. (Barnendokrinologisk forskning/Tuvemo)
2003 (English)In: Acta Paediatrica, ISSN 0803-5253, E-ISSN 1651-2227, Vol. 92, no 10, 1138-1143 p.Article in journal (Refereed) Published
Abstract [en]

Aim: To study the effect of size at birth on different dimensions of intellectual capacity. Methods: The study comprised a population-based cohort including all male single births without congenital malformations in Sweden from 1973 to 1976, and conscripted before 1994 (n= 168 068). Information from the Swedish Birth Register was individually linked to the Swedish Conscript Register. The test of intellectual performance included four different dimensions: logical, spatial, theoretical and verbal capacity. These data were available for 80–86% of the males at conscription. Results: Compared with boys born appropriate for gestational age, males born small for gestational age (SGA) had an increased risk for subnormal performance in all four dimensions. Among males born SGA who were also of short adult stature at conscription, and in individuals born SGA with a head circumference < – 2 SDS at birth, the risk of subnormal performance was most marked in the logical dimension (OR 1.52; CI 1.25–1.84 and 1.33; 1.15–1.55, respectively).

Conclusions: Being born small for gestational age is associated with increased risk of subnormal capacity in all four dimensions of intellectual performance. In SGA males, short adult stature, or a small head circumference at birth is especially associated with the risk of subnormal logical performance.

Place, publisher, year, edition, pages
2003. Vol. 92, no 10, 1138-1143 p.
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:uu:diva-90793DOI: 10.1111/j.1651-2227.2003.tb02473.xOAI: oai:DiVA.org:uu-90793DiVA: diva2:163268
Available from: 2003-09-17 Created: 2003-09-17 Last updated: 2013-07-30Bibliographically approved
In thesis
1. Born Small for Gestational Age: Impact of Linear Catch-up Growth
Open this publication in new window or tab >>Born Small for Gestational Age: Impact of Linear Catch-up Growth
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The purposes of the thesis were to study associations between size at birth, short adult stature and risks of subnormal intellectual performance, high blood pressure, and overweight among males, and to study associations between size at birth, short adult stature and risk of overweight and giving birth to small for gestational age (SGA) infants among females.

The effect of short adult stature on intellectual performance among males was analyzed in two population-based cohort studies. Data were obtained from the Swedish Birth Register which was individually linked to the Swedish Conscript Register. Being born SGA was associated with increased risks of subnormal intellectual performance in all four dimensions included in the test, and lack of catch-up growth leading to short adult stature further increased this risk. If anything, logical performance was found to be most affected.

To estimate the risk of high blood pressure in males born SGA we used the Birth Register linked to the Conscript Register. Being born SGA was associated with a slightly increased risk of high systolic blood pressure, and being born light and ending up with short adult stature further increased this risk.

Association between short adult stature and overweight was analyzed in both males and females born SGA, in two different studies. In the male cohort data from the Birth Register was linked to the Conscript Register. In females the Birth Register was used twice, when the females were born and when they gave birth to their first child. In both the male and female cohort, there was an increased risk of becoming overweight among those born SGA who also ended up with short adult stature.

Finally, an intergeneration study was performed using the Birth Register to analyze associations between being born short for gestational age and giving birth to short infants. Catch-up growth to normal adult stature among women born short-for-gestational age was associated with reduced risk of giving birth to a short-for-gestational age infant.

Conclusions. Among males born SGA, short adult stature is associated with increased risk of subnormal intellectual performance, high blood pressure and overweight compared to those with normal adult stature. Similarly, among females born SGA, there is an increased risk of becoming overweight in those with short adult stature, compared with those not short as adult. Females born short for gestational age, with short adult stature are at increased risk of giving birth to a short infant.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2003. 46 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine, ISSN 0282-7476 ; 1285
Keyword
Pediatrics, Pediatrik
National Category
Pediatrics
Identifiers
urn:nbn:se:uu:diva-3563 (URN)91-554-5725-8 (ISBN)
Public defence
2003-10-10, Rosénsalen, Barnsjukhuset, Uppsala, 09:15
Opponent
Supervisors
Available from: 2003-09-17 Created: 2003-09-17Bibliographically approved

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Lundgren, MariaTuvmeo, Torsten

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