Comparison of spirometric reference values

Area of Science:

• Pulmonary Medicine
• Pediatric Respiratory Health
• Biostatistics

Background:

• Lung-function reference values are crucial for diagnosing and managing respiratory conditions.
• Existing spirometry reference equations for children vary, impacting clinical accuracy.
• Recent general spirometry equations cover broader age ranges (8-80 years).

Purpose of the Study:

• To compare the predictive accuracy of broad age-range spirometry reference equations against established pediatric equations.
• To evaluate the suitability of general reference equations for the pediatric population.

Main Methods:

• Spirometry, height, and weight data were collected from 70 healthy children aged 6-18 years.
• Measured spirometry values were compared against predictions from both general and pediatric reference equations.
• Differences between measured and predicted values were analyzed for forced expired volume in 1 second (FEV1) and forced vital capacity (FVC).

Main Results:

• General, wider age-range equations showed significant differences from measured pediatric values (7-16% for FEV1/FVC).
• Established pediatric equations demonstrated higher accuracy, with smaller differences from measured values (1-4% for FEV1/FVC).
• Predictive accuracy of general equations was notably lower in the pediatric group, particularly for younger children.

Conclusions:

• Wider age-range spirometry equations may lack predictive accuracy in pediatric populations.
• Established pediatric spirometry equations are recommended for use in children.
• Extrapolating reference equations beyond their original age range is not advised for accurate pediatric lung-function assessment.