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. Author manuscript; available in PMC: 2014 Nov 1.
Published in final edited form as: Thorax. 2014 Jun 13;69(11):987–996. doi: 10.1136/thoraxjnl-2014-205160

Figure 3. Pi10 According to COPD Status in SPIROMICS.

Figure 3

*p<0.05 for comparison of mean Pi10 between participants with no COPD to those with COPD. Calculation of Pi10 required 5 or more airways per participant; therefore, Pi10 was not computed for generations 0 to 2. Mean values and differences adjusted for age, gender, height, race-ethnicity, smoking status, airway length, percent emphysema−950HU, BMI-determined CT dose, and lung volume at CT.

Abbreviations: COPD denotes chronic obstructive pulmonary disease, SPIROMICS Subpopulations and Intermediate Outcome Measures in COPD Study, CI confidence interval, HU Hounsfield units, BMI body mass index, and CT computed tomography.