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A longitudinal study of spirometry in young black and young white children
Insights
This study on pediatric lung function found significant differences in forced vital capacity (FVC) and forced expiratory volume in one second (FEV1) between racial and sex groups in children. These findings highlight the importance of considering race and sex in pediatric pulmonary assessments.
Area of Science:
- Pediatric Pulmonology
- Respiratory Physiology
- Growth and Development
Background:
- Longitudinal spirometry data in children is crucial for understanding lung development.
- Previous studies have not extensively analyzed race and sex differences in early childhood lung function.
- Establishing normative data for pediatric lung function across diverse populations is essential.
Purpose of the Study:
- To longitudinally assess lung function parameters in a cohort of young children.
- To investigate potential differences in maximal expiratory flow-volume parameters based on race and sex.
- To establish the feasibility of spirometry testing in pre-school-aged children.
Main Methods:
- Longitudinal spirometry performed over 8 years on 72 children (aged 3+).
- Analysis of 6 maximal expiratory flow-volume parameters: FVC, FEV1, PEF, FEF25-75, Vmax50, Vmax75.
- Weighted straight-line regressions of parameters on height (100-150 cm) and statistical comparisons between racial and sex groups.
Main Results:
- Significant differences in FVC and FEV1 were observed between white females and males, white females and black females, and white males and black males.
- FEF25-75 and Vmax50 showed significant differences for black females vs. white females and white males vs. white females.
- Vmax75 differed significantly only between white females and black females; PEF showed no significant differences across groups.
Conclusions:
- The study expands the age range for evaluating lung function in children, including pre-schoolers.
- Race and sex significantly influence specific lung function parameters in children.
- Provides novel analytical approaches for longitudinal pediatric lung function data.
Abstract:
Spirometry was performed longitudinally over a period of 8 yr on 72 children (29 black females, 26 black males, 9 white females, and 8 white males) starting as early as 3 yr of age. Weighted straight-line regressions of 6 maximal expiratory flow-volume parameters--forced vital capacity (FVC), forced expiratory volume in one second (FEV1), peak expiratory flow (PEF), forced expiratory flow during the middle half of the FVC (FEF25-75), and maximal expiratory flows after 50 and 75% of the FVC had been exhaled (Vmax50 and Vmax75, respectively) - on height were computed and were found to describe adequately the data over a height range of 100 to 150 cm. Statistical comparisons of regression lines revealed significant differences for FVC and FEV1 when white females were compared with white males, white females with black females, and white males with black males, but not for black females with black males. Regressions of FEF25-75 and Vmax50 for black females were significantly lower than for white females, and those for white males were lower than those for white females, but no differences were detected when black females and white males were compared with black males. Only white females compared with black females revealed significant differences for Vmax75. There were no significant differences for any of the comparisons for PEF. The data presented expand the age range for evaluating lung function in children, indicate the feasibility of testing pre-school-age subjects, and provide new approaches to analysis of longitudinally collected information.