Determinants of Respiratory Health in Young Adults

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00005361
Recruitment Status : Completed
First Posted : May 26, 2000
Last Update Posted : May 13, 2016
Information provided by:
National Heart, Lung, and Blood Institute (NHLBI)

Brief Summary:
To measure lung function and respiratory symptom status in a large cohort of healthy, non-smoking 18-22 year old subjects, and relate these measurements to past histories of passive smoke and air pollution exposures.

Condition or disease
Lung Diseases

Detailed Description:


While the natural history of human lung function growth and decline has been studied intensively over the past 30 years, relatively few data have been collected during the period in which peak volumetric function is achieved, i.e., around the age of 20. As a result, very little is known about the factors, both demographic and environmental, which influence maximal attained lung function.


The longitudinal study collected information on the history of respiratory illness, residential history, parental smoking, socio-economic status and home characteristics via an initial questionnaire administered to cadets enrolling at West Point. A sequence of four annual measurements of lung function (by spirometry), and prior-year respiratory health status and activity patterns was obtained in the spring of each year. Pollution exposures were estimated by matching residential histories with historical pollution data stored at the Environmental Protection Agency. Data on meteorological variables (temperature, relative humidity, wind speed) and altitude were obtained for each residential location. The four annual lung function measurements provided precise estimates of individual mean levels of FVC, FEV1, FEF25-75, PEFR, and flow rates at 50 percent and 75 percent of expired FVC. Subject-specific lung function level was analyzed in relation to history of parental smoking and prior exposure to air pollution using analysis of variance methods, controlling for potential confounding variables. In addition to testing these hypotheses regarding the respiratory effects of passive smoking and air pollution exposure, the study also explored the effects of these exposures on the change in lung function between the ages of 18 and 22 and on respiratory illness and symptom experience while at West Point. Finally, the study established a cohort which could be followed in future years.

The study completion date listed in this record was obtained from the "End Date" entered in the Protocol Registration and Results System (PRS) record.

Study Type : Observational
Study Start Date : April 1993
Actual Study Completion Date : March 1998

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Ages Eligible for Study:   up to 100 Years   (Child, Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
No eligibility criteria