Subjects with Discordant Airways Obstruction: Lost between Spirometric Definitions of COPD

<table>Study subjects with FEV1/FVC &gt; LLN (<svg height="11.225" id="M11" style="vertical-align:-0.27588pt" version="1.1" viewbox="0 0 58.537498 11.225" width="58.537498" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,11.225)">
<g transform="translate(72,-63.02)">
<text transform="matrix(1,0,0,-1,-71.95,63.35)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝑛</tspan>
<tspan style="font-size: 12.50px; " x="9.6773224" y="0">=</tspan>
<tspan style="font-size: 12.50px; " x="21.71771" y="0">1</tspan>
<tspan style="font-size: 12.50px; " x="27.969212" y="0">0</tspan>
<tspan style="font-size: 12.50px; " x="34.220711" y="0">5</tspan>
<tspan style="font-size: 12.50px; " x="40.47221" y="0">9</tspan>
</text>
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</svg>): relationship between FEV1/FVC% and age. Lines represent regression of FEV1/FVC ratio by age (solid line) with 95% confidence limits for mean predicted values (dotted lines). The horizontal line indicates the 70% level of the FEV1/FVC ratio.</table>

Pulmonary Medicine

fig1

Figure 1

Figure 1: Subjects with Discordant Airways Obstruction: Lost between Spirometric Definitions of COPD 