Lung function tests in normal Indian children

Area of Science:

• Pediatric Pulmonology
• Respiratory Physiology

Background:

• Pulmonary function assessment is crucial for evaluating respiratory health in children.
• Establishing normative data for lung function parameters is essential for accurate clinical interpretation.

Purpose of the Study:

• To determine lung function parameters in healthy Indian children.
• To investigate the correlation of lung function with age, height, and weight.
• To identify the most significant predictor of lung function in children.

Main Methods:

• Computerized spirometry was used to measure forced vital capacity, forced expiratory volume in one second, peak expiratory flow, mid-expiratory flow, and maximum voluntary ventilation.
• Data from 632 healthy children (aged 6-15) in Bombay were analyzed.
• Pulmonary function data were stratified by sex, height, and age, with stepwise regression analysis.

Main Results:

• Lung function variables showed a linear positive correlation with height and age.
• Forced vital capacity and forced expiratory volume in one second increased significantly after 150 cm height.
• Height was the most significant independent variable explaining variance in lung function parameters.

Conclusions:

• Height is the most critical parameter for clinical evaluation of lung function in children.
• Standard lung function equations should prioritize height as the primary predictor.
• Sex differences exist in certain lung function parameters, particularly at specific age and height thresholds.