Record Display for the EPA National Library Catalog


Main Title Normal Range of Diurnal Changes in Peak Expiratory Flow Rates: Relationship to Symptoms and Respiratory Disease.
Author Quackenboss, J. J. ; Lebowitz, M. D. ; Krzyzanowski., M. ;
CORP Author Arizona Univ., Tucson. Div. of Respiratory Sciences.;Environmental Protection Agency, Research Triangle Park, NC.
Publisher cJun 91
Year Published 1991
Report Number EPA-R-815650; EPA/600/J-91/167;
Stock Number PB91-231357
Additional Subjects Diurnal variations ; Respiratory diseases ; Peak expiratory flow rate ; Signs and symptoms ; Asthma ; Air pollution effects(Humans) ; Occupational exposure ; Airway resistance ; Test methods ; Aging(Biology) ; Spirometry ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB91-231357 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 10p
Measuring peak expiratory flow rates (PEFR) several times a day can provide an objective assessment of functional changes relative to environmental or occupational exposures. The report describes the pattern of diurnal changes in PEFR in a reference population, and defines ranges of normal between-and within-day variability. An index of diurnal changes were defined as the ratio between maximal and minimal values, where the maximal value was restricted to PEFR measured at noon or in the evening (N,E) and the minimal value was restricted to the morning or at bedtime (M,B). A ratio greater than normal represented an exaggeration of the normal diurnal pattern in PEFR. Normal limits, based on the ninety-fifth percentile in the reference population, were larger for children (130%) than for adults 15 to 35 yr of age (117%) and those older than 35 yr of age (118%). The meaningfulness of excessive diurnal changes in PEFR was examined by relating this ratio (Max/Min), and a similar measure (the amplitude percent mean) to chronic respiratory symptoms and diseases in 939 adults and children who recorded PEFR values 2 to 4 times per day for as long as 14 days.