Table 3 Prevalence of asthma and sensitisation to airborne allergens at 8 years of age and adjusted association with breast feeding (subgroup of the total study population, n = 1553)
PrevalencePrevalence by breast feeding durationBF 1–16 weeks, adjusted†BF>16 weeks, adjusted†
None1–16 weeks>16 weeks
%No%No%No%NoOR (95% CI)OR (95% CI)
Asthma‡14.021714.23415.911511.5681.12 (0.73 to 1.71)0.77 (0.48 to 1.22)
Sensitisation§27.542729.67127.920226.21540.89 (0.64 to 1.24)0.80 (0.57 to 1.14)
Asthma and sensitisation8.71358.32010.2747.0411.19 (0.70 to 2.01)0.75 (0.42 to 1.34)
Asthma without sensitisation5.3825.8145.7414.6271.00 (0.53 to 1.89)0.84 (0.42 to 1.68)
Sensitisation§ stratified by allergy mother/father:
Non-allergic mother (n = 986)23.623322.83625.011622.3811.17 (0.75 to 1.82)1.03 (0.64 to 1.64)
Allergic mother (n = 567)34.219442.73533.18632.4730.62 (0.36 to 1.05)0.58 (0.33 to 1.01)
Non-allergic father (n = 1064)24.225726.94624.712222.3890.88 (0.59 to 1.32)0.76 (0.49 to 1.16)
Allergic father (n = 489)34.817036.22534.88034.2650.91 (0.51 to 1.63)0.88 (0.48 to 1.63)
  • *p<0.05.

  • †No breastfeeding is reference. Associations are adjusted for gender, maternal allergy, paternal allergy, maternal education, maternal smoking during pregnancy, and smoking by anyone in the house at 8 years.

  • ‡Defined as at least one attack of wheeze, one episode of dyspnoea or a prescription of inhaled steroids in the last year.

  • §Defined as a specific immunoglobulin E concentration of at least 0.70 IU/ml on at least one of the airborne allergens.

  • BF, breast feeding.