Interpretation of pediatric lung function: impact of ethnicity

Area of Science:

• Pediatric Pulmonology
• Ethnic Disparities in Health
• Lung Function Testing

Background:

• Reference equations for spirometry and plethysmography are crucial for interpreting lung function in children.
• Existing equations may not accurately reflect lung function in diverse ethnic groups.
• Evaluating the appropriateness of current equations across different ethnicities is essential for accurate diagnosis.

Purpose of the Study:

• To assess the suitability of current spirometric and plethysmographic reference equations in healthy Black and White children.
• To identify ethnic-specific differences in lung function measurements.
• To determine the need for revised or new reference equations for pediatric lung function testing.

Main Methods:

• Collected spirometry data from 400 healthy children (6-12 years; 214 Black, 186 White).
• Performed plethysmography on a subset of children (68 Black, 115 White).
• Expressed results as percent predicted using standard spirometry and plethysmography equations.

Main Results:

• Black children exhibited lower lung function than White children for a given height.
• Ethnic-specific Wang equations were suitable for spirometry in both groups.
• Plethysmography results showed significant discrepancies with existing equations, particularly for Black children's function residual capacity (FRC) and total lung capacity (TLC).
• White children's lung function generally fit Rosenthal equations, except for FRC.

Conclusions:

• Spirometry reference equations may be adequate for Black children.
• Current static lung volume reference equations are inappropriate for Black children, limiting accurate interpretation.
• There is an urgent need for plethysmographic reference equations applicable to all ethnic groups across a wide age range.