The effect of age on the relationship between birth order and IgE sensitisation

Stephen William Turner, L. J. Palmer, N. A. Gibson, P. J. Rye, J. Goldblatt, L. I. Landau, P. N. Le Souef

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Abstract

Background An association between birth order and IgE sensitization or allergic diseases has been reported in many studies.

Objective To assess the effect of age on the relationship between reduced IgE sensitization and increased birth order and to test the hypothesis that this would decline with increasing age.

Methods As part of a birth cohort study, IgE sensitization to common allergens was determined by skin prick testing at ages 6 and 12 months, 6 and 11 years.

Results The original cohort numbered 253 individuals of whom 96 (38%) were first born. Compared with individuals with older siblings, first-born individuals had increased IgE sensitization at 6 (odds ratio (OR) 2.4 [95% confidence interval (CI) 1.0, 6.3], P=0.05, n=197) and 12 months of age (OR 6.7 [1.7, 25.0] P=0.002, n=172) and at 6 years of age (OR 2.3 [1.0, 5.6] P=0.05, n=113) but not at 11 years of age (OR 1.2, P > 0.4, n=182). When age at onset of IgE sensitization was considered (n=61), 16 had infant onset IgE sensitization (nine were first born), 24 had early childhood onset IgE sensitization (nine first born) and 21 had late childhood onset IgE sensitization (two first born), P=0.0016. Further analysis revealed a similar pattern for children with older brothers (P=0.0097) but not older sisters (P=0.5).

Conclusions These findings indicated that having an older brother delays the onset of IgE sensitization but may not prevent IgE sensitization per se. The apparent protective effect of older siblings on allergic diseases reported elsewhere might involve delaying the onset of IgE sensitization.

Original languageEnglish
Pages (from-to)630-634
Number of pages4
JournalClinical & experimental allergy
Volume35
DOIs
Publication statusPublished - 2005

Keywords

  • longitudinal study
  • siblings
  • skin prick positivity
  • ADULT ATOPY
  • SIBLINGS
  • NUMBER
  • ASTHMA
  • CHILDHOOD
  • ALLERGY
  • DETERMINANTS
  • CHILDREN
  • FAMILY
  • SIZE

Cite this

Turner, S. W., Palmer, L. J., Gibson, N. A., Rye, P. J., Goldblatt, J., Landau, L. I., & Le Souef, P. N. (2005). The effect of age on the relationship between birth order and IgE sensitisation. Clinical & experimental allergy, 35, 630-634. https://doi.org/10.1111/j.1365-2222.2005.02229.x

The effect of age on the relationship between birth order and IgE sensitisation. / Turner, Stephen William; Palmer, L. J.; Gibson, N. A.; Rye, P. J.; Goldblatt, J.; Landau, L. I.; Le Souef, P. N.

In: Clinical & experimental allergy, Vol. 35, 2005, p. 630-634.

Research output: Contribution to journalArticle

Turner, Stephen William ; Palmer, L. J. ; Gibson, N. A. ; Rye, P. J. ; Goldblatt, J. ; Landau, L. I. ; Le Souef, P. N. / The effect of age on the relationship between birth order and IgE sensitisation. In: Clinical & experimental allergy. 2005 ; Vol. 35. pp. 630-634.
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T1 - The effect of age on the relationship between birth order and IgE sensitisation

AU - Turner, Stephen William

AU - Palmer, L. J.

AU - Gibson, N. A.

AU - Rye, P. J.

AU - Goldblatt, J.

AU - Landau, L. I.

AU - Le Souef, P. N.

PY - 2005

Y1 - 2005

N2 - Background An association between birth order and IgE sensitization or allergic diseases has been reported in many studies.Objective To assess the effect of age on the relationship between reduced IgE sensitization and increased birth order and to test the hypothesis that this would decline with increasing age.Methods As part of a birth cohort study, IgE sensitization to common allergens was determined by skin prick testing at ages 6 and 12 months, 6 and 11 years.Results The original cohort numbered 253 individuals of whom 96 (38%) were first born. Compared with individuals with older siblings, first-born individuals had increased IgE sensitization at 6 (odds ratio (OR) 2.4 [95% confidence interval (CI) 1.0, 6.3], P=0.05, n=197) and 12 months of age (OR 6.7 [1.7, 25.0] P=0.002, n=172) and at 6 years of age (OR 2.3 [1.0, 5.6] P=0.05, n=113) but not at 11 years of age (OR 1.2, P > 0.4, n=182). When age at onset of IgE sensitization was considered (n=61), 16 had infant onset IgE sensitization (nine were first born), 24 had early childhood onset IgE sensitization (nine first born) and 21 had late childhood onset IgE sensitization (two first born), P=0.0016. Further analysis revealed a similar pattern for children with older brothers (P=0.0097) but not older sisters (P=0.5).Conclusions These findings indicated that having an older brother delays the onset of IgE sensitization but may not prevent IgE sensitization per se. The apparent protective effect of older siblings on allergic diseases reported elsewhere might involve delaying the onset of IgE sensitization.

AB - Background An association between birth order and IgE sensitization or allergic diseases has been reported in many studies.Objective To assess the effect of age on the relationship between reduced IgE sensitization and increased birth order and to test the hypothesis that this would decline with increasing age.Methods As part of a birth cohort study, IgE sensitization to common allergens was determined by skin prick testing at ages 6 and 12 months, 6 and 11 years.Results The original cohort numbered 253 individuals of whom 96 (38%) were first born. Compared with individuals with older siblings, first-born individuals had increased IgE sensitization at 6 (odds ratio (OR) 2.4 [95% confidence interval (CI) 1.0, 6.3], P=0.05, n=197) and 12 months of age (OR 6.7 [1.7, 25.0] P=0.002, n=172) and at 6 years of age (OR 2.3 [1.0, 5.6] P=0.05, n=113) but not at 11 years of age (OR 1.2, P > 0.4, n=182). When age at onset of IgE sensitization was considered (n=61), 16 had infant onset IgE sensitization (nine were first born), 24 had early childhood onset IgE sensitization (nine first born) and 21 had late childhood onset IgE sensitization (two first born), P=0.0016. Further analysis revealed a similar pattern for children with older brothers (P=0.0097) but not older sisters (P=0.5).Conclusions These findings indicated that having an older brother delays the onset of IgE sensitization but may not prevent IgE sensitization per se. The apparent protective effect of older siblings on allergic diseases reported elsewhere might involve delaying the onset of IgE sensitization.

KW - longitudinal study

KW - siblings

KW - skin prick positivity

KW - ADULT ATOPY

KW - SIBLINGS

KW - NUMBER

KW - ASTHMA

KW - CHILDHOOD

KW - ALLERGY

KW - DETERMINANTS

KW - CHILDREN

KW - FAMILY

KW - SIZE

U2 - 10.1111/j.1365-2222.2005.02229.x

DO - 10.1111/j.1365-2222.2005.02229.x

M3 - Article

VL - 35

SP - 630

EP - 634

JO - Clinical & experimental allergy

JF - Clinical & experimental allergy

SN - 0954-7894

ER -