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https://ciane.net/id=2076

Created on : 12 Dec 2007
Modified on : 27 Oct 2018

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Bibliographical entry (without author) :

Birth weight and adult lung function. (Letter) Thorax 2007;62:1016-1017

Author(s) :

Chandra Sekhar Devulapalli

Year of publication :

2007

URL(s) :

http://thorax.bmj.com/cgi/content/extract/62/11/10…

Résumé (français)  :

Dans un récent article publié dans Thorax, Canoy et ses collaborateurs ont conclu que les bébés ayant un poids faible à la naissance et une faible croissance pouvaient présenter un risque plus élevé de développer une fonction pulmonaire altérée à l’âge adulte. En contradiction avec ces résultats, aucun lien n’a été trouvé entre le poids à la naissance et la fonction pulmonaire de l’adulte, ni entre le poids à la naissance et les symptômes d’asthme dans une population nordique-baltique étudiée par Laerum et autres. Les études des caratéristiques à à la naissance et des résultats respiratoires donnent des résultats contradictoires, car les méthodes utilisées dans les différentes études varient. Bien que Canoy et ses collaborateurs aient présenté des résultats intéressants dans le cadre d’une vaste étude, des questions d’ordre méthodologique et des interprétations de ces résultats ont donc été soulevées.

Les auteurs mentionnent que la prise de poids au cours de la première année était positivement associée à la fonction pulmonaire plus tard dans la vie, laquelle est restée significative après ajustement pour divers facteurs de confusion potentiels au cours de la vie. Qu’en est-il des enfants présentant des symptômes respiratoires tôt dans la vie? Des études ont montré qu’il existait une association entre les symptômes initiaux des voies respiratoires et la fonction pulmonaire ultérieure et les maladies respiratoires, et que les sujets asthmatiques présentaient une fonction pulmonaire réduite persistante. Enfin, les auteurs ont-ils pris en compte les antécédents familiaux d’asthme et/ou d’atopie ou de sensibilisation allergique? À mon avis, de nombreux facteurs de confusion et facteurs susceptibles d’avoir une incidence sur les résultats n’ont pas été traités de manière adéquate dans le présent document. Par conséquent, les conclusions tirées risquent de ne pas être pertinentes.

Abstract (English)  :

In a recent paper published in Thorax Canoy and co-workers concluded that babies with lower birth weight and poor infant growth may be at a higher risk of developing impaired adult pulmonary function. In contradiction to these findings, no association was found between birth weight and adult lung function or between birth weight and asthma symptoms in a Nordic-Baltic population studied by Laerum et al. Studies of birth characteristics and respiratory outcomes give contradictory results as methods used in different studies vary. Although Canoy et al1 showed some interesting findings in a large cohort study, it raises some methodological questions and thereby interpretation of the findings.

The authors state that data on potential confounders and mediating factors operating throughout the life course were prospectively collected. Many of the known early life variables and adult variables were taken into consideration in logistic regression analyses. Canoy et al have focused on the nutritional status of the mother and birth weight. However, I wonder whether some relevant factors known to influence weight during the first year of life were missing. For example, it is a known fact that children of diabetic mothers often have heavier babies (large for gestational age) at birth compared with other term babies. This has not been discussed in the paper. Furthermore, have the authors taken into account factors that could influence the development of weight during the first year? What about the nutritional status of the children or conditions that may lead to nutritional disorders during the first year? Did the authors consider other chronic childhood disorders that may impair growth? Only two measurements of weight (at birth and around 12 months of age) during the first year will hardly reflect the natural growth of the child over time.

The authors mention that weight gain during the first year was positively associated with lung function later in life, which remained significant after adjustments for various potential confounders across the life course. What about children with respiratory symptoms early in life? Studies have shown that there is an association between initial airway symptoms and later lung function and respiratory illnesses, and that subjects with asthma have persistent reduced lung function. Finally, did the authors account for family history of asthma and/or atopy or allergic sensitisation? In my opinion, many confounders and factors that may have an effect on the outcome were not addressed adequately in this paper, so the conclusions drawn may not be relevant.

Sumário (português)  :

Resumen (español)  :

Full text (public) :

Comments :

Argument (français) :

Réponse à un article de Canoy et al., 2006 (http://afar.info/id=2074)

Argument (English):

Response to an article by Canoy et al., 2006 (http://afar.info/id=2074)

Argumento (português):

Resposta a um artigo de Canoy et al., 2006 (http://afar.info/id=2074)

Argumento (español):

Keywords :

➡ premature baby ; low birth weight

Author of this record :

Bernard Bel — 12 Dec 2007
➡ latest update : Bernard Bel — 27 Oct 2018

Related records
#2074   Canoy, Dexter; Pekkanen, Juha; Elliott, Paul; Pouta, Anneli; Laitinen, Jaana; Hartikainen, Anna-Liisa; Zitting, Paavo; Patel, Swatee; Little, Mark P; Jarvelin, Marjo-Riitta (2007). Early growth and adult respiratory function in men and women followed from the fetal period to adulthood. Thorax, 62, 5, p.396-402. ➡ https://ciane.net/id=2074
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