| Allergy |
| Atopic dermatitis |
| Allergic rhinitis |
| Elevated total serum IgE levels (first year of life) |
| Peripheral blood eosinophilia >4% (2-3 yr of age) |
| Food and inhalant allergen sensitization |
| Gender |
| Boys |
| Transient wheezing |
| Persistent allergy-associated asthma |
| Girls |
| Asthma associated with obesity and early-onset puberty |
| Triad asthma (adulthood) |
| Parental asthma |
| Lower respiratory tract infection |
| Respiratory syncytial virus, parainfluenza |
| Severe bronchiolitis (e.g., requiring hospitalization) |
| Pneumonia |
| Environmental tobacco smoke exposure (including prenatal) |
Reference:
Nelson Essential of Pediatrics 6th Edition