Bronchiectasis Demographics
Bronchiectasis predominantly affects women (approximately 60-80% of patients) and is typically diagnosed in the sixth to seventh decade of life, with a mean age at diagnosis of 54-64 years.
Age Distribution
The age pattern shows a clear trend toward older populations:
- Mean age at diagnosis: 54-64 years 1, 2
- Age at symptom onset: Average of 37 years, indicating a diagnostic delay of approximately 17 years 2
- Prevalence increases with age: The disease becomes progressively more common in older age groups 3, 4
- Patients are often subdivided clinically into those ≤65 years and >65 years for management considerations 5
The substantial diagnostic delay (17 years between symptom onset and diagnosis) 2 represents a critical clinical pitfall—bronchiectasis symptoms are often attributed to other conditions like asthma or chronic bronchitis, delaying appropriate diagnosis and treatment.
Gender Distribution
Female predominance is consistent across multiple large cohorts:
- The US Bronchiectasis Research Registry showed 79% female patients 1
- A Korean health screening study found 11.5% prevalence in females versus 7.9% in males (p = 0.022) 3
- This female predominance is particularly pronounced in patients with nontuberculous mycobacterial (NTM) disease, who tend to be older women 1
Gender-Specific Clinical Differences
Important distinctions exist between male and female patients 5:
- Females: Higher rates of non-smoking (94.0% vs 36.8% in males), better lung function (higher FEV1%pred and FEV1/FVC), more post-measles and connective tissue disease etiologies, higher Pseudomonas aeruginosa infection rates in those >65 years
- Males: More COPD-related bronchiectasis, higher inflammatory markers (CRP), worse blood gas parameters (higher PaCO2), and higher hospital costs
Geographic and Population Variations
First Nations populations experience disproportionately high disease burden with earlier age at diagnosis, more extensive disease on imaging, higher exacerbation rates, and greater mortality 4. This is associated with higher rates of childhood respiratory infections and socioeconomic disadvantage.
Clinical Context
The typical bronchiectasis patient profile emerging from the highest quality recent data 1, 4 is: a white, female, never-smoker in her mid-60s, though this varies by etiology. Post-infectious bronchiectasis presents at younger ages (mean symptom onset significantly younger than idiopathic cases, p < 0.0001) 2, while NTM-associated bronchiectasis affects older women specifically 1.
The increasing prevalence over the past 25 years (52.5 to 1248.7 per 100,000) 4, 6 likely reflects improved CT imaging and heightened clinical awareness rather than true disease increase, suggesting many patients remain undiagnosed.