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Dry night cough as a marker of allergy in preschool children: the PARIS birth cohort

Authors

  • Fanny Rancière,

    1. Univ Paris Descartes, Sorbonne Paris Cité, EA 4064, Laboratoire Santé Publique et Environnement, Paris, France
    2. Mairie de Paris, Direction de l'Action Sociale de l'Enfance et de la Santé, Cellule Cohorte, Paris, France
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  • Lydia Nikasinovic,

    1. Univ Paris Descartes, Sorbonne Paris Cité, EA 4064, Laboratoire Santé Publique et Environnement, Paris, France
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  • Isabelle Momas

    Corresponding author
    1. Mairie de Paris, Direction de l'Action Sociale de l'Enfance et de la Santé, Cellule Cohorte, Paris, France
    • Univ Paris Descartes, Sorbonne Paris Cité, EA 4064, Laboratoire Santé Publique et Environnement, Paris, France
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Correspondence

Isabelle Momas, Laboratoire Santé Publique et Environnement, EA 4064, Faculté des Sciences Pharmaceutiques et Biologiques, Université Paris Descartes, 4 avenue de l'Observatoire, 75006 Paris, France.

Tel.: +33 1 53 73 97 26

Fax: +33 1 43 25 38 76

E-mail: isabelle.momas@parisdescartes.fr

Abstract

Background

Early detection of children at risk for developing allergy is an important challenge. Our first analyses in infants from the Pollution and Asthma Risk: an Infant Study (PARIS) birth cohort suggested that dry night cough was associated with parental-reported allergic disorders. The aim of the present study was to refine this finding by investigating the time course of dry night cough from birth to age 4 yr in relation to blood markers of atopy and allergic morbidity.

Methods

Health outcomes were regularly assessed by parental self-administered questionnaires. Blood markers of atopy were measured at age 18 months. Children with similar patterns of dry night cough over the first 4 yr of life were grouped together using k-means clustering. Associations with atopy/allergy were studied using multinomial logistic regression.

Results

Three trajectories of dry night cough were identified in 1869 children. Besides the never/infrequent pattern (72.4%), the transient pattern (8.8%) was composed of children who coughed in the first year and recovered by age 4 yr, while the rising pattern (18.8%) included all symptomatic children at age 4 yr, whether they were persistent or late coughers. Compared with the never/infrequent pattern, the rising pattern was significantly associated with elevated total immunoglobulin E (IgE) level (odds ratio [OR] = 1.70, 95% confidence interval [CI] = 1.21–2.39) and inhalant allergens sensitization (OR = 2.66, 95% CI = 1.26–5.61) at age 18 months, and with doctor-diagnosed allergic diseases over the first 4 yr such as hay fever (OR = 2.52, 95% CI = 1.49–4.26) and eczema (OR = 1.29, 95% CI = 1.00–1.66).

Conclusions

This study provides evidence that persistent/late dry night cough may indicate allergy in preschool children.

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