Occurrence of atopic diseases in three generations

Area of Science:

• Epidemiology
• Genetics
• Allergy and Immunology

Background:

• Atopic diseases, including asthma, hay fever, and atopic dermatitis, represent a significant public health concern.
• Understanding the familial aggregation and prevalence trends of these conditions is crucial for public health strategies.

Purpose of the Study:

• To assess the incidence and prevalence of atopic diseases across three generations within a large family cohort.
• To investigate the influence of heredity on the development of atopic conditions.
• To identify trends in the prevalence of atopic dermatitis in children over time.

Main Methods:

• A questionnaire-based study was conducted involving 2820 families across three generations.
• Data collection focused on the incidence of asthma, hay fever, and atopic dermatitis.
• Statistical analysis was performed to evaluate prevalence, familial aggregation, and generational differences.

Main Results:

• 35% of families exhibited atopy when considering parental and grandparental histories.
• 64% of atopic children had a personal history of atopy, compared to 31% of non-atopic individuals.
• Prevalence rates were highest in the parents' generation (13.5%), followed by children (10.8%) and grandparents (7.6%), with a notable increase in childhood atopic dermatitis since the 1950s.

Conclusions:

• The study confirms a strong hereditary influence on the development of atopic diseases.
• An increasing trend in childhood atopic dermatitis prevalence was observed in Finland.
• While heredity is a key factor, environmental influences may also contribute to the rising incidence.