Modelling the lung function of Caucasians during adolescence as a basis for reference values

Area of Science:

• Pediatric Pulmonology
• Human Growth and Development
• Biometric Modeling

Background:

• Lung size and stature relationships change during adolescent growth spurts.
• Standard lung function models based solely on stature are inadequate for this age group.
• An age x stature interaction model improves spirometric index predictions.

Purpose of the Study:

• To test if a simple age x stature interaction model improves predictions for total lung capacity and its subdivisions.
• To evaluate the model's effectiveness for the single breath transfer factor for carbon monoxide.
• To assess the model's applicability across childhood and adolescence.

Main Methods:

• Utilized data from 695 non-smoking Caucasians aged 7-20 years.
• Modeled lung function indices using an age x stature interaction.
• Compared model fit against stature-only linear, power, and polynomial models.

Main Results:

• The age x stature interaction term was significant for most lung function indices.
• The model demonstrated a significantly improved fit, especially for older adolescent boys.
• Reference values derived from the new model are presented.

Conclusions:

• A model incorporating stature and age interaction effectively explains lung size and transfer factor changes during growth.
• This single equation encompasses children and adolescents, accounting for body habitus variations.
• The model is recommended for deriving reference values when only stature and age are available.