A. (BAMSE) Probability of allergic multimorbidity (asthma and rhinitis) reported at 8 or 16, but not at 4 years of age. B. (MAAS). Probability of allergic multimorbidity (asthma and rhinitis) reported at 8 or 16, but not at 3 or 5 years of age. C. (BAMSE). Probability of having allergic multimorbidity (asthma and rhinitis), i.e. disease at both 8 and 16 years irrespective of disease at 4 years of age. D. (MAAS). Probability of having allergic multimorbidity (asthma and rhinitis), i.e. disease reported at both 8 and 16, irrespective of disease at 3–5 yrs.