NIOSHTIC-2 Publications Search

Agreement between fixed-ratio and lower limit of normal spirometry interpretation protocols decreases with age: is there a need for a new GOLD standard?

Mikulski MA; Gerke AK; Lourens S; Czeczok T; Sprince NL; Laney AS; Fuortes LJ

J Occup Environ Med 2013 Jul; 55(7):802-808

https://doi.org/10.1097/JOM.0b013e31828b22cc

20042913

Objectives: To assess concordance between the fixed 70% ratio cutoff point with the fixed percent predicted values (Fixed-ratio) and the lower limit of normal (LLN) algorithms in interpreting spirometry results in an older population. Methods: Spirometries were interpreted using Third National Health and Nutrition Examination Survey reference equations for 2319 workers. Results: The Fixed-ratio algorithm characterized 34.5% (n = 801) results as abnormal, compared with 29.7% (n = 689) by the LLN. There were almost twice as many obstructive and mixed airways spirometries identified under the Fixed-ratio compared to LLN. Rates of restrictive pattern physiology were virtually the same under each algorithm. Overall agreement between the algorithms decreased with age from "almost perfect" for those younger than 60 years to "substantial" for those older than 80 years. Conclusions: This study found age-related discordance between two algorithms possibly related to the lack of reference equations and standards for individuals older than 80 years.

Respiratory-system-disorders; Spirometry; Age-factors; Testing-equipment; Mathematical-models; Statistical-analysis; Standards; Analytical-instruments; Analytical-processes; Health-surveys; Measurement-equipment; Airway-obstruction; Pulmonary-function-tests; Physiology; Lung-function; Surveillance

Marek Mikulski, MD, PhD, MPH, The University of Iowa, 2213 Westlawn, Iowa City, IA 52242

JOEMFM

20130701

Journal Article

marek-mikulski@uiowa.edu

2013

B20130805

7

1076-2752

DRDS

Journal of Occupational and Environmental Medicine

IA; WV