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Am. J. Respir. Crit. Care Med., Volume 162, Number 2, August 2000, 430-435

Lung Function Reference Values in Chinese Children and Adolescents in Hong Kong
II. Prediction Equations for Plethysmographic Lung Volumes

MARY S. M. IP, EVA M. KARLBERG, KWOK-NING CHAN, JOHAN P. E. KARLBERG, KEITH D. K. LUK, and JOHN C. Y. LEONG

Departments of Medicine, Orthopedic Surgery, and Pediatrics, The University of Hong Kong, Hong Kong SAR, China

As part of a comprehensive evaluation of lung function in Hong Kong Chinese children and adolescents, over a thousand healthy subjects aged 7-19 yr from seven schools were recruited for lung function testing that included spirometry and, in many cases, lung subdivision measurements. Lung function tests were performed using SensorMedics Automated Body Plethysmograph according to published standards. Of these, 551 subjects (219 males), aged 8-19 yr, had satisfactory lung subdivision indices recorded. Analysis for the values of lung subdivisions including total lung capacity (TLC), residual volume (RV), and functional residual capacity (FRC) demonstrated that standing height and sitting height were the best predictors of lung volumes. After allowing for standing height or sitting height in the regression models for lung volumes, age at examination was the second best parameter, although its inclusion into the equations contributed to less than 1% of explained variance for boys and 3% for girls. These are the first reported data in international literature on reference values for lung subdivisions in Chinese children and adolescents.




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