Table 4.

Prevalence of respiratory impairment, stratified by GOLD, ATS/ERS, and LMS criteria, as well as by study sample

Spirometric Threshold	Airflow Limitation		Restrictive-pattern
	No. (%)
	NHANES III N=1,548	ARIC N=7,972	NHANES III N=1,548	ARIC N=7,972
GOLDa	344 (22.2)	1,723 (21.6)	147 (9.5)	387 (4.9)
ATS/ERSb	268 (17.3)	1,256 (15.8)	167 (10.8)	452 (5.7)
LMSc	243 (15.7)	1,142 (14.3)	111 (7.2)	314 (3.9)

Abbreviations: NHANES III, Third National Health and Nutrition Examination Survey; ARIC, Atherosclerosis Risk in Communities Study; GOLD, Global Initiative for Obstructive Lung Disease; ATS/ERS, American Thoracic Society/European Respiratory Society; LMS, Lambda-Mu-Sigma method; ATS/ERS-LLN₅, ATS/ERS defined lower limit of normal; LMS-LLN₅, LMS defined lower limit of normal; FEV1/FVC, forced expiratory volume in 1-second to forced vital capacity.

^aBased on a fixed-ratio threshold, with airflow limitation defined by a FEV1/FVC<0.70, while restrictive-pattern is defined by a FEV1/FVC≥0.70 and FVC<80% predicted. Percent predicted is calculated as [(measured ÷ predicted) * 100].

^bBased on a threshold of ATS/ERS-LLN₅, with airflow limitation defined by a FEV1/FVC<ATS/ERS-LLN₅, while restrictive-pattern is defined by a FEV1/FVC≥ATS/ERS-LLN₅ and FVC<ATS/ERS-LLN₅.

^cBased on a threshold of LMS-LLN₅, with airflow limitation defined by a FEV1/FVC<LMS-LLN₅, while restrictive-pattern is defined by a FEV1/FVC≥LMS-LLN₅ and a FVC<LMS-LLN₅.