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Fig. 1
Distribution of room-air baseline pulse oximetry (Spo2) values in 871 awake, asymptomatic adults.
Abstract
Objective
We sought to determine the distribution of oximetry (Spo2) values in awake, asymptomatic adults and the effect of personal characteristics on these values.
Methods
Using a cross-sectional design, we sampled oximetry readings in awake, asymptomatic adults in an emergency department setting. Personal characteristics were analyzed using logistic regression, with lower oximetry readings, defined by the 20th percentile, as the dependent variable.
Results
Of 871 eligible subjects, 50 (5.7%) had an Spo2 value less than 97%, and 13 (1.5%) had an Spo2 value less than 96%. Lower readings were associated with the following characteristics (odds ratio with 95% confidence interval): male sex, 3.8 (2.5-5.6); age ≥60 years, 2.4 (1.3-4.5); white race, 5.3 (3.6-7.8); obesity, 3.2 (2.1-4.8); history of asthma, 3.2 (1.6-6.2). Smoking was not associated with lower Spo2 values.
Conclusion
Room-air Spo2 values less than 97% are rare in asymptomatic, awake adults. White race and male sex are associated with lower Spo2 readings.
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☆Supported by a grant from the University of Maryland Statewide Health Network Other Tobacco-Related Diseases Fund.
☆☆Presented at the American Thoracic Society International Conference, San Diego, Calif, May 2006.
