Dataset Information

The increased purchase of asthma medication for individuals born preterm seems to wane with age: A register-based longitudinal national cohort study.

ABSTRACT:

Introduction

Preterm birth is associated with increased risk of respiratory symptoms in childhood, often treated with asthma medication. We designed a follow-up study to previous research and investigated whether the association of gestational age with purchasing asthma medication diminishes in adulthood.

Methods

We conducted a register-based study of a national cohort of all infants born in Denmark in 1980-2009 evaluating longitudinal data on individually prescribed asthma medication (both inhaled ß-2 receptor agonist and different controller treatment over 2-year periods) available from 1995-2011. We analyzed the effect of gestational age considering age, birth year, and perinatal variables using logistic regression with a Generalized Estimating Equations model. All data were unambiguously linked through the Civil Registration System.

Results

We included 1,819,743 individuals in our study population. We found an inverse dose-response relationship between gestational age and asthma medication in earlier age-groups with a gradual decrease in odds ratios with increasing age and loss of statistical significance in early adulthood (18-31 years). For our oldest generations, there was a significant effect of gestational age (p-value = 0.04), which became insignificant when adjusting for confounding and mediating factors (p = 0.44). There were significant interactions between gestational age and age (p<0.0001) and gestational age and birth year, but these were most important during childhood (0-11 years) and for our youngest generations (born after 1995).

Conclusion

The strong association between gestational age and purchase of prescription asthma medication weakens with age into early adulthood, in consistence with the results from our previous study. The risk for purchasing medication to treat asthma-like symptoms was higher in more recent birth years, but the effect of gestational age was small beyond 11 years of age. Gestational age per se did not seem to be significant for the development of asthma-like symptoms: most of its effect could be explained by other perinatal factors.

SUBMITTER: Damgaard ALB

PROVIDER: S-EPMC6033435 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature

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Publications

The increased purchase of asthma medication for individuals born preterm seems to wane with age: A register-based longitudinal national cohort study.

Damgaard Anne Louise de Barros ALB Gregersen Rasmus R Lange Theis T Buchvald Frederik F Hansen Bo Mølholm BM Greisen Gorm G

PloS one 20180705 7

<h4>Introduction</h4>Preterm birth is associated with increased risk of respiratory symptoms in childhood, often treated with asthma medication. We designed a follow-up study to previous research and investigated whether the association of gestational age with purchasing asthma medication diminishes in adulthood.<h4>Methods</h4>We conducted a register-based study of a national cohort of all infants born in Denmark in 1980-2009 evaluating longitudinal data on individually prescribed asthma medica ...[more]

PMID: 29975752

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Project description:AIM:To understand the relationship between cognition and white-matter structure in adolescents born preterm without obvious brain injury. METHODS:Thirty-two adolescents from a longitudinal study of child development were selected according to risk of developmental disorders at birth (born at term: eight males, five females; median age 16y 1mo, interquartile range 10mo; low risk preterm: four males, five females, median age 16y, range 4mo; high risk preterm: three males, seven females, median age 16y 2mo, range 1y 2mo) and reading ability (good: three males, eight females, median age 16y, range 7mo; average: six males, three females, median age 16y 10mo, range 1y; poor: six males, six females, median age 16y, range 6mo). Preterm birth was defined as a gestational age of 36 weeks or less and a birthweight of 1600g or less. All participants had normal clinical neuroimaging findings. We examined fractional anisotropy, radial diffusivity, and volume of three major white-matter fasciculi. The relationship between structural measures and birth risk, hemisphere, and cognitive ability (attention, lexical and sublexical decoding, auditory phonological awareness, and processing speed) were analysed using mixed-model regression. RESULTS:Left-hemisphere superior longitudinal fasciculus (SLF) fractional anisotropy and radial diffusivity were linked to reading-related skills (fractional anisotropy vs letter-word identification, r((30))=-0.37, p<0.05; fractional anisotropy vs phoneme reversal, r((30))=-0.34, p=0.05; radial diffusivity vs letter-word identification, r((30))=0.31, p<0.10; radial diffusivity vs phoneme reversal, r((30))=0.40, p<0.05), whereas right-hemisphere SLF fractional anisotropy was related to attention skills (fractional anisotropy vs inattentiveness, r((30))=-0.38, p<0.05). SLF volume decreased as these skills declined for adolescents born preterm (volume vs phoneme reversal, r((17))=0.58, p<0.01; volume vs inattentiveness, r((17))=-0.69, p<0.01), but not for those born at term. INTERPRETATION:The relationship between cognitive skills and SLF volume suggests that in adolescents born preterm, cryptic white-matter injury may exist, possibly related to oligodendrocyte or axonal loss, despite normal clinical neuroimaging.

Dataset Information

The increased purchase of asthma medication for individuals born preterm seems to wane with age: A register-based longitudinal national cohort study.

Introduction

Methods

Results

Conclusion

Publications

The increased purchase of asthma medication for individuals born preterm seems to wane with age: A register-based longitudinal national cohort study.

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